ALEKS: Predicting relative boiling point elevations and freezing point depressions

[@karajohnson913]

Thank you. What you do helps a lot. I get very frustrated with Aleks. Last semester I refused to do it. It costed me an "A", I don't want to do that again, and I did not have the patience for Alex last semester but I'm not going to cost myself a letter grade this semester so what you are doing is very very much appreciated thank you so much.

[@RoxiHulet]

Oh dang, that's really unfortunate - I'm glad that you're going to stick with it this semester. I have a ton of videos - you can *absolutely* get through ALEKS :)

[@iLYKEf00d]

you're saving me right now, thank you so much.

[@RoxiHulet]

You’re welcome!!!

[@Cryinghorseman]

I got a problem that used an 'HI' compound and the answer gave it a i = 2. Isn't HI not ionic?

[@sabrinarosewhite]

I think strong acids will have i = 2 because H+ and I- will both be present in the solution. I was having the same problem.

[@akshadakulkarni9607]

Hi I'm really confused on what you mean by "the least significant change". I am just not able to connect the dots on how that is helping figure out the order they should be put in.

[@RoxiHulet]

Least significant change = smallest value of delta T = smallest deviation from the boiling or feeezing point of pure water

[@akshadakulkarni9607]

@@RoxiHulet so the smallest value of delta T would be the lowest freezing point and the highest boiling point? Thank you so much for your help! Your videos are life savers!

[@RoxiHulet]

@@akshadakulkarni9607You’ve got it backwards… boiling point always goes up, and the amount that it goes up is equal to delta T. So the *largest* delta T will have the highest boiling point. Freezing point goes down, so the *largest* delta T will have the lowest boiling point. This is tricky stuff - don’t give up!!

[@akshadakulkarni9607]

@@RoxiHulet I think I get it. I will keep trying to understand it better. Thank you so much!

[@RoxiHulet]

@@akshadakulkarni9607 you’re very welcome! You can totally do it!!! I believe in you :)

[@zionsimanian9310]

Roxi if you see this could you possibly make a video on the topic called “Using molarity to find solute mass and solution volume”? If you ever make one in the future , thank you!!

[@twentyjunes1167]

You’ve likely long left the chem class you were taking by now, but she did end up making a video on that topic!

[@sydneyrice4525]

I dont know if you'll see this in time but for instance, say you have KCH3CO2, and K2SO4, would the i values for these be i=2, and i=3, respectively? becuase there is 2 K's in the first and 1 in the second?

[@RoxiHulet]

Yep, you got it. Good job!

[@electron-xgaming2444]

How do you know what i = if you have the element KCH3CO2? There's only one cation and multiple anions.

[@RoxiHulet]

CH3CO2 is the polyatomic anion “acetate”, so this compound has one cation and one anion, and i = 2.

[@electron-xgaming2444]

@@RoxiHulet That makes sense thank you so much!

[@samanthadavantes3599]

A chem student hero