got the answer wrong for 2nd part ALEK says to do [1/2(5.4x10^-16/0.00140)^1/2

It would be 2x for the second problem since the equation is NaOH

Thank you!

@RoxiHulet

5 ай бұрын

You're welcome!

thanks

@RoxiHulet

2 жыл бұрын

No problem! :)

LIFE SAVERRRRRRR

i thought small x approximation only works if the X is added or subtracted? I don't understand why we can ignore the 2x

@RoxiHulet

Жыл бұрын

The rule is still applied, we are still adding x. It “x + x” (or 2x), but it is still being added to 0.140 and it is still much smaller than 0.140.

@Arunasweets

3 ай бұрын

Think about it like you have $1,000,000 + $0.01; the 1¢ is so meaningless compared to the million dollars you have. With the 2x, it’s like $1,000,000 + $0.02; 2¢ is still insignificant to the million dollars.

How would the second part look if the Na was Na2? Would you square?

@RoxiHulet

3 ай бұрын

You would treat it the same way as I treated OH in this problem. It would be 2x in the ICE table, and it would be squared in the Ksp equation.

@starbeom

3 ай бұрын

hi! so in the ksp equation, why is it 2x squared? instead of it just being 2x? @@RoxiHulet

@RoxiHulet

2 ай бұрын

@@starbeom The 2x represents the molarity and the fact that the initial reactant produces two of those cations in solution. So, if the solution started with 1M Na2S (for example) and that substance dissociated, it would produce two Na ions, and the total Na concentration would be 2M. Separately, the square is how the stoichiometric coefficient is represented in the Ksp equation. This is a really confusing idea, and most students feel that the 2 is being double-counted when we use 2x^2. Hang in there.

PLEASEEE DO MORE GEN CHEM 2 problems 😢

@RoxiHulet

4 ай бұрын

This is actually #1 on my list of stuff to do! I hear ya! I got really bogged down with my actual job :) so I've had to take a break for a while. I'll be back at it in a week. Tell me which problems you'll need (not today, but starting in about a week) and I'll move them to the top of my list!

@lilly7060

3 ай бұрын

@@RoxiHulet "understanding the difference between strong and weak acids"

@bella_manto

3 ай бұрын

@@RoxiHulet titration problems