What's the Point of Molality?!?
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- Опубликовано: 3 окт 2024
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Molality is not as common as molarity, and it has a funny name. What is the point? Molal solutions can be easier to make than molar solutions. Also, molality doesn't change as solutions expand and contract, so they stay constant while molar solutions can change. So even though molarity is more common, there are some advantages to molal solutions.
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.
@Far Deen But we are measuring molality and molarity at THAT PARTICULAR INSTANT of when its 4 degree Celsius & when its 98 degree Celsius
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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.
Tyler DeWitt
Sir please send the link
Molality will not affect by evaporation of solvent (mass will decrease)by increasing the temperature?
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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.
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.
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Can you do Molality problems?
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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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sir thank you for this excellent video and can you plz make a video on problem solving of molality related question ,please.
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Great explanation!
thank you so much for this video rellay now I know more thing a bout moliraty and moliality
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Excellent.
That was beautifully done. Thank you.
This is such a huge help thank you!
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?🌼
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Can you please do a video that will show us how we do Molality problems?
Good
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thank you so much i now actually understand why we have to use molality!!! :)
Super Helpful
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?
Thank you so much!
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.
That's why bottles have tops. If you are careless and allow water to evaporate from a solution, there is no effective way to measure or explain the concentration.
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can you make a video about Dilution problems? and parts per million (ppm)?...
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nice explanation and attractive
Plz tell about the temprature dependency of molality and molarity
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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?
Tres intéressant!
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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?
When the question problem involves change of temperature I need to use morality instead of molarity?
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.
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Why doesn't "1kg water" change at different temperatures or pressure like in molarity example?
Because weight never changes. If a brick weighs 10 kg, it weighs 10 kg when it’s freezing, it weighs 10 kg when it’s boiling hot. It weighs 10 kg under height pressure at the bottom of the ocean, and it weighs 10 kg at the top of Mt. Everest, where pressure is low.
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Sir is there any video about common ion effect??
I have one doubt mr. Actually how to prepare 3gram of samples like a organic or inorganic products
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Will you make video on normality
Please
Thanks!
But doesn't water expand when it freezes?
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.
Ah okay, thanks!
+Tyler DeWitt I did not know that! That's so cool hahah get it cool
+Tyler DeWitt I did not know that! That's so cool hahah get it cool
@@tdewitt451 yeah
v nice
sir I have one question, in qualitative analysis can be use Na2 s at the place of Hydrogen sulphide,
Thanks a lot
sir. how about when it has density given in the problem?
Rex Rivera density= mass/volume. if you have density and mass OR volume, you can find the third quantity
so then why use molarity
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So the real question is why use molarity?!!!
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should've just not let molarity exist man ._.