good question. yes you're absolutely right that water expands when it's frozen solid (to make ice), but before this phase change happens and the water is still liquid, cold water contracts and hot liquid water expands.

yes..... best teacher in the world,

Even a baby can learn chemie with you.Thanks!

Hey everyone, I'm here to help. If you have any questions or just want to learn more, click on the link in the description above. It'll take you to a page where you can ask me questions.

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Love it man. You are seriously the next Bill Nye the Science Guy. Your videos are like that Khan guy, only better. You're more interesting, there's no weird black background and you've got sweet prepared flash cards. It's always a pleasure to see you bust out a new flashcard! Seriously, I really appreciate how well thought out your videos are, easy to follow, and visually clear and compelling. A+

Literally a human genius; we appreciate you so much and you will never know how much you mean to us!!

you are explaining it much easier than any of my teachers, thank god that you exist:)

These videos are great at explaining sciencetific concepts glad you keep posting them!

another advantage of molality is that it's used for in finding the change of boiling point and freezing point.

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Man I learnt more in your videos than in my whole year at school.

Can you do Molality problems?

Sir, I was perplexed about the molality but today you made it simpler. Thanks for your explanation. Please support students like us with your explanation.

Excellent video! I'm a visual learner and this was great.

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Great topic and presentation! I would like to ask if you could please cover, the conversion between these two concentration concepts, so we may derive concentration for use in quantifying analytes in samples that differ in density to water.

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Great explanation!

That was beautifully done. Thank you.

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Sir your videos are extremely helpful to me.you created me interest in chemistry.please upload videos in organic chemistry also

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sir I have one question, in qualitative analysis can be use Na2 s at the place of Hydrogen sulphide,

thank you so much for this video rellay now I know more thing a bout moliraty and moliality

Can you please do a video that will show us how we do Molality problems?

Excellent.

sir thank you for this excellent video and can you plz make a video on problem solving of molality related question ,please.

Great videos! Thanks! As you point out, Molarity is tempurature (and pressure?) dependant where as Molality is not. Frequently, it IS easier to weight out the mass of solvent and get Molality -- but the referenceing calculations or literature might reference Molarity. If I know the tempurature AND eqn of state for my solvent, I can grind through the algebra and convert to Molarity. Could you demonstrate any simple techniques for converting back and forth between Molality/Molarity?

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Super Helpful

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thank you so much i now actually understand why we have to use molality!!! :)

thanks Tyler!

nice explanation and attractive

Plz tell about the temprature dependency of molality and molarity

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thanks

hi, your videos helped me a lot with my assignments and reviewers.. can you replace our teacher? LOL can you make a video about Dilution problems? and parts per million (ppm)?...

I have one doubt mr. Actually how to prepare 3gram of samples like a organic or inorganic products

Sir is there any video about common ion effect??

Tres intéressant!

If the temperature continues to rise and some of the water is evaporated, would that not alter the weight? Or is there a point that should be considered before it starts evaporating?

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We are considering a closed system where water cannot evaporate right? Because that's what always bothers me, weight doesn't depend on temperature but if you loose water for evaporation you are loosing it. So nobody says that but in molarity vs molality we are always assuming no evaporation, right?

Good

4°c means the temperature is too low (comparing with 98°c) that means it will be cold until freezes, when water freeze it will expand that means its volume will increase, BUT it will not contract Example liquid water and ice. Am I right or not please?🌼

Nice

Thank you sir love ❤ from india

I don't understand this question can you help me.. calculate the molarity of k+ in a solution formed by mixing 0.020 L of 0.020 M solution of k2SO4 with 0.010 L of 0.020 M solution of k3PO4.

But if you increase or decrease the temperature, doesn't water evaporate making the kg of solvent decrease or increase ultimately changing the molality of the solution.

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Thanks! But doesn't water expand when it freezes?

Why doesn't "1kg water" change at different temperatures or pressure like in molarity example?

sir. how about when it has density given in the problem?

Will you make video on normality

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you should also try teaching maths

When the question problem involves change of temperature I need to use morality instead of molarity?

Thanks a lot

so then why use molarity

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So the real question is why use molarity?!!!

Be looking like a ken in pink.

should've just not let molarity exist man ._.