Solving PH/PoH

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StephanieIb
Posts: 100
Joined: Wed Sep 30, 2020 9:37 pm

Solving PH/PoH

Postby StephanieIb » Fri Dec 11, 2020 7:19 pm

Regarding solving for PH, POH, etc do we just need to know how to do the 6B textbook problems?

Valerie Tran 2B
Posts: 53
Joined: Wed Sep 30, 2020 9:48 pm
Been upvoted: 2 times

Re: Solving PH/PoH

Postby Valerie Tran 2B » Fri Dec 11, 2020 8:32 pm

I think so. If you can do those problems confidently then you should be fine for anything on the final.

Evonne Hsu 1J
Posts: 106
Joined: Wed Sep 30, 2020 9:35 pm

Re: Solving PH/PoH

Postby Evonne Hsu 1J » Fri Dec 11, 2020 8:39 pm

I believe the final will definitely test us on concepts and questions in regards to pH, pOH, [H+],[OH-], etc. Doing the textbook questions will definitely benefit you as well.

505612629
Posts: 44
Joined: Wed Sep 30, 2020 9:43 pm

Re: Solving PH/PoH

Postby 505612629 » Fri Dec 11, 2020 9:08 pm

I believe the textbook problems are up for grabs on the final, so I think it's safe to say that they're good practice!

Juliet Carr 1F
Posts: 97
Joined: Wed Sep 30, 2020 9:36 pm

Re: Solving PH/PoH

Postby Juliet Carr 1F » Sat Dec 12, 2020 12:08 pm

I think the important takeaways from solving problems with PH and POH are:
[H3O+][OH-] = 1 x 10^-14
pH + pOH = 14
pH = -log[H3O+]
pOH = -log[OH-]

So being able to apply these concepts and doing the textbook problems are probably sufficient enough.

Kamille Kibria 2A
Posts: 90
Joined: Wed Sep 30, 2020 9:52 pm

Re: Solving PH/PoH

Postby Kamille Kibria 2A » Sat Dec 12, 2020 8:58 pm

i think you should be fine if you just know all the calculations for pH and pOH and you could most likely plug and chug for this concept. I'm not sure if it's posted on chem community but in the TA review session on acids and bases w Katherine she posted a rly helpful square w all the calculations that makes it super easy to visualize
pH + pOH = 14
pH = -log[H+]
pOH = =log[OH-]
[OH-][H+] = 1e14

Leyla Anwar 3B
Posts: 90
Joined: Wed Sep 30, 2020 10:03 pm

Re: Solving PH/PoH

Postby Leyla Anwar 3B » Sat Dec 12, 2020 10:24 pm

Image

This is what the square looked like and helps if only given one value you're trying to find the other.

Lucy Weaver 1K
Posts: 108
Joined: Wed Sep 30, 2020 9:56 pm

Re: Solving PH/PoH

Postby Lucy Weaver 1K » Sun Dec 13, 2020 9:03 am

It helps me to remember these rules
pH: -log of (H+ concentration)
pH: 14-pOH
pOH:14-pH
pOH: -log of (OH- concentration)
H+: 10^-pH
OH-: 10^-pOH

David Y
Posts: 96
Joined: Wed Sep 30, 2020 9:49 pm

Re: Solving PH/PoH

Postby David Y » Tue Dec 15, 2020 11:55 am

If given the molarity of an H+ ion, then you take the -log of that molarity to gain the pH. Then, you do 14-pH in order to give you the pOH

Hannah Chang 3K
Posts: 95
Joined: Sat Oct 17, 2020 12:15 am

Re: Solving PH/PoH

Postby Hannah Chang 3K » Tue Dec 15, 2020 1:20 pm

I pretty much just memorized the formulas and did lots of practice problems.

Andrew Yoon 3L
Posts: 92
Joined: Wed Sep 30, 2020 9:36 pm

Re: Solving PH/PoH

Postby Andrew Yoon 3L » Tue Dec 15, 2020 2:05 pm

Yeah just know the relationship between pH, pOH, [H+], [OH-]. If you know the relationships among them well, you should be good!

Halle Villalobos 3E
Posts: 90
Joined: Wed Sep 30, 2020 9:52 pm

Re: Solving PH/PoH

Postby Halle Villalobos 3E » Wed Dec 16, 2020 1:57 pm

Hi! It is important to remember these basic formulas:
pH + pOH = 14
pH = -log[H+]
[H+] = 10^(-pH)
pOH = -log[OH-]
[OH-] = 10^(-pOH)


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