Molarity, Molality, Volume & Mass Percent, Mole Fraction & Density - Solution Concentration Problems
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- Опубликовано: 25 июн 2024
- This video explains how to calculate the concentration of the solution in forms such as Molarity, Molality, Volume Percent, Mass Percent, and Mole Fraction. It also explains how to calculate the Molarity of the solution given mass percent and density.
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Thanks for the videos. I have been following you a good number of times. And I must admit that you are the best. But have a little concern about the second problem of the lesson. Calculating a volume percent. I was told that mass is additive when you are working with percentage concentrations. But volume is not. But I noticed problem 2 while finding V% you added the 25 ml plus the 150 ml to give you 175ml. Why is that so? If the v% formula is V% is the volume of solute divided by the volume of solution. I am not challenging you but just a concern and I want to learn. Thanks.
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1. Find mole fraction of glucose in 5% solution which is used as normal saline. 2. There are two solutions of one substance. The osmotic pressure of the first one is less than that of the other one. Which solution freezes at lower temperature? 3. What is the depression in freezing point of 1% albumin solution? The molar mass of albumin is 68000 g / mol.
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I hope you will read this, but I would like to know (14:09) why is the 150mL of H2O was the solute? From what I have solved from that problem it is supposed to be 19.8g of methanol instead of the water so the mass percent of the water is supposed to be 11.7% not 88.3%. I am a fan of your videos I hope you could correct this for us.
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now i know cuz girl u need to find the mass percentage of the water instead of the methanol so therefore the water becomes the solute hehe
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It's not that the water really becomes the solute, The mass percent could also be of the solvent rather than the solute. Water will not be solute. The solute is always the one in lower quantity. Don't write it in the exam that water becomes the solute
Here you need to find the mass percent of the solvent I believe so they've written it like that
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Thank you, sir, for this tutorial. It really helped me. However, I do have one issue, which is that I'm a bit confused in the section concerning the decimal places you utilized in your answers.
me too. i tried solving it with my calculator the answers were correct just the decimals placed were different from the video
To get the v% ,you have to first get the volume of solution.which is volume of solute + volume of solvent,i.e 150ml volume of solvent plus 25ml volume of soulute.. although methanol and water are substances that can be used in dissolving i.e they can both be seen as solvent.But, since the volume of water in this case is higher than that of methanol,he simply made methanol the solute and water the solvent.
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