Great video man

thanks mans

at 3:41 How is the value 0.1017? I multiplied 0.6323M and 0.16L and my answer was 0.101168.mols.

@celinamontero3503

4 жыл бұрын

same

@folklore_of_beth

3 жыл бұрын

probably just forgot the extra 1....

i received 1.56*1x^-10 instead of 1.55

@kcmcnamara3344

3 жыл бұрын

I did too

Can you please explain your final steps? In your videos you keep trailing off... and I have no idea how to get to your final answers.

@TonyStJohn

6 жыл бұрын

Hi Sarah, are you talking about how to convert from [H+] to pH or [OH-] to pOH? To do that you just take the negative log of the concentration. In other words, pH = -log[H+] and pOH = -log[OH-]

@Zoe-ze7di

6 жыл бұрын

I'm so confused how you got from each step to the next. It just felt like you understand where to go next and I can't follow why you're doing that. And I'm really confused on the algebra that was done or how you got the Ka value and why the values I'm getting when I try to mimic this aren't as small as your values are.

@TonyStJohn

6 жыл бұрын

Hmmm, hi Zoe, I can definitely understand your struggles, this is one of the hardest topics to conceptually understand maybe in all of ALEKS. There is just so much going on that it will be hard to follow unless you have a solid foundation. I will try to answer some of your questions and give you on overview of what is going on as best as I can here... So, basic idea first... you have a weak base that you are titrating with a strong acid, therefore, at the equivalence point, all of the weak base will have been turned into weak acid. That resulting weak acid (which is really the product of the titration) will then contribute to the final pH of the solution (it really just becomes a weak acid problem at this point). So, to find the pH of a weak acid, we need the Ka (found earlier in the video from the relationship b/w Kb and Ka for conjugate acid/base pairs) and the initial molarity (M) of the weak acid (found from the titration step). Does that help? Do you have other specific questions? Good luck!

Hu

total volume in ALEKS is starting volume though