Koncentrácia roztokov je základná téma v chémii, ktorá ti pomôže... Show more
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Updated Apr 26, 2026
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Jak vypočítať a chápať koncentrácie roztokov
1 / 7
Čo je koncentrácia a základné pojmy
Predstav si, že miešaš ovocný sirup s vodou. Koncentrácia ti povie, koľko sirupu je v tvojom nápoji. V chémii je to rovnaké - hovorí nám, koľko rozpustenej látky máme v roztoku.
Roztok sa skladá z dvoch častí: rozpúšťadla (väčšinou voda) a rozpustenej látky (napríklad soľ alebo cukor). Keď ich zmiešaš, dostaneš homogénnu zmes - vyzerá ako jedna látka.
Pamätaj si základnú rovnicu: hmotnosť roztoku = hmotnosť rozpúšťadla + hmotnosť rozpustenej látky. Toto ti pomôže pri všetkých výpočtoch!
Tip: Vždy si v zadaní najprv označ, čo je rozpúšťadlo, čo rozpustená látka a čo celý roztok.
Hmotnostný a objemový zlomok
Hmotnostný zlomok (w) je najjednoduchší spôsob vyjadrenia koncentrácie. Vzorec je: w = hmotnosť rozpustenej látky / hmotnosť roztoku. Výsledok je číslo bez jednotky, často v percentách.
Príklad: 10 g soli + 90 g vody = 100 g roztoku. w = 10g/100g = 0,1 = 10%.
Objemový zlomok (φ) funguje podobne, len s objemami: φ = objem rozpustenej látky / objem roztoku. Používa sa hlavne pre kvapaliny, ako alkohol vo víne.
Pozor: Pri objemoch sa nesčítavajú vždy presne , ale pre naše výpočty to predpokladáme.
Látková koncentrácia
Látková koncentrácia (c) je najdôležitejšia v chémii, pretože pracuje s mólmi. Vzorec: c = látkové množstvo / objem roztoku (v litroch). Jednotka je mol/L.
Najprv musíš vypočítať látkové množstvo: n = hmotnosť / molárna hmotnosť. Molárnu hmotnosť nájdeš v periodickej tabuľke.
Príklad: 11,7 g NaCl v 200 mL roztoku. Molárna hmotnosť NaCl ≈ 58,5 g/mol. n = 11,7g / 58,5g/mol = 0,2 mol. c = 0,2 mol / 0,2 L = 1 mol/L.
Nezabudni: Objem musí byť v litroch! 200 mL = 0,2 L.
Riešené príklady krok za krokom
Tu sú typické príklady zo skúšok:
Príklad 1: 25 g cukru + 225 g vody. Celková hmotnosť = 250 g. w = 25g/250g = 0,1 = 10%.
Príklad 2: Dezinfekcia "70% obj." v 0,5 L fľaši. Objem alkoholu = 0,7 × 500 mL = 350 mL.
Príklad 3: 8 g NaOH v 200 mL roztoku . n = 8g/40g/mol = 0,2 mol. c = 0,2 mol/0,2 L = 1 mol/L.
Stratégia: Vždy si napíš, čo máš dané a čo hľadáš, potom vyber správny vzorec.
Praktické tipy a časté chyby
Jednotky sú kľúčové! Skontroluj si ich pred každým výpočtom. 1 L = 1000 mL, 1 kg = 1000 g.
Percentá: Vždy ich preveď na desatinné číslo delením 100. Takže 25% = 0,25.
Molárna hmotnosť: Pre jednoatomové látky ju nájdeš priamo v periodickej tabuľke. Pre molekuly (ako NaCl, H₂SO₄) spočítaj atómové hmotnosti všetkých atómov.
Pozor na slovíčka: Ak zadanie hovorí "doplnili objem na 250 mL", znamená to, že celý roztok má 250 mL, nie že si pridal 250 mL vody!
Pre skúšku: Nezabudni na jednotky vo výsledku a vždy skontroluj, či ti vyšiel rozumný výsledek.
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
Most popular content in Chémia
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The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
Jak vypočítať a chápať koncentrácie roztokov
Koncentrácia roztokov je základná téma v chémii, ktorá ti pomôže pochopiť, ako "silné" alebo "slabé" sú tvoje roztoky. Je to ako s čajom - môžeš mať veľmi sladký (vysoká koncentrácia cukru) alebo nesladký (nízka koncentrácia).
Čo je koncentrácia a základné pojmy
Predstav si, že miešaš ovocný sirup s vodou. Koncentrácia ti povie, koľko sirupu je v tvojom nápoji. V chémii je to rovnaké - hovorí nám, koľko rozpustenej látky máme v roztoku.
Roztok sa skladá z dvoch častí: rozpúšťadla (väčšinou voda) a rozpustenej látky (napríklad soľ alebo cukor). Keď ich zmiešaš, dostaneš homogénnu zmes - vyzerá ako jedna látka.
Pamätaj si základnú rovnicu: hmotnosť roztoku = hmotnosť rozpúšťadla + hmotnosť rozpustenej látky. Toto ti pomôže pri všetkých výpočtoch!
Tip: Vždy si v zadaní najprv označ, čo je rozpúšťadlo, čo rozpustená látka a čo celý roztok.
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Hmotnostný a objemový zlomok
Hmotnostný zlomok (w) je najjednoduchší spôsob vyjadrenia koncentrácie. Vzorec je: w = hmotnosť rozpustenej látky / hmotnosť roztoku. Výsledok je číslo bez jednotky, často v percentách.
Príklad: 10 g soli + 90 g vody = 100 g roztoku. w = 10g/100g = 0,1 = 10%.
Objemový zlomok (φ) funguje podobne, len s objemami: φ = objem rozpustenej látky / objem roztoku. Používa sa hlavne pre kvapaliny, ako alkohol vo víne.
Pozor: Pri objemoch sa nesčítavajú vždy presne , ale pre naše výpočty to predpokladáme.
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Látková koncentrácia
Látková koncentrácia (c) je najdôležitejšia v chémii, pretože pracuje s mólmi. Vzorec: c = látkové množstvo / objem roztoku (v litroch). Jednotka je mol/L.
Najprv musíš vypočítať látkové množstvo: n = hmotnosť / molárna hmotnosť. Molárnu hmotnosť nájdeš v periodickej tabuľke.
Príklad: 11,7 g NaCl v 200 mL roztoku. Molárna hmotnosť NaCl ≈ 58,5 g/mol. n = 11,7g / 58,5g/mol = 0,2 mol. c = 0,2 mol / 0,2 L = 1 mol/L.
Nezabudni: Objem musí byť v litroch! 200 mL = 0,2 L.
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Riešené príklady krok za krokom
Tu sú typické príklady zo skúšok:
Príklad 1: 25 g cukru + 225 g vody. Celková hmotnosť = 250 g. w = 25g/250g = 0,1 = 10%.
Príklad 2: Dezinfekcia "70% obj." v 0,5 L fľaši. Objem alkoholu = 0,7 × 500 mL = 350 mL.
Príklad 3: 8 g NaOH v 200 mL roztoku . n = 8g/40g/mol = 0,2 mol. c = 0,2 mol/0,2 L = 1 mol/L.
Stratégia: Vždy si napíš, čo máš dané a čo hľadáš, potom vyber správny vzorec.
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Praktické tipy a časté chyby
Jednotky sú kľúčové! Skontroluj si ich pred každým výpočtom. 1 L = 1000 mL, 1 kg = 1000 g.
Percentá: Vždy ich preveď na desatinné číslo delením 100. Takže 25% = 0,25.
Molárna hmotnosť: Pre jednoatomové látky ju nájdeš priamo v periodickej tabuľke. Pre molekuly (ako NaCl, H₂SO₄) spočítaj atómové hmotnosti všetkých atómov.
Pozor na slovíčka: Ak zadanie hovorí "doplnili objem na 250 mL", znamená to, že celý roztok má 250 mL, nie že si pridal 250 mL vody!
Pre skúšku: Nezabudni na jednotky vo výsledku a vždy skontroluj, či ti vyšiel rozumný výsledek.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user