6D.7

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Emily Chirila 2E
Posts: 112
Joined: Sat Jul 20, 2019 12:16 am

6D.7

Postby Emily Chirila 2E » Thu Jan 16, 2020 1:16 pm

The problem:
Find the initial concentration of the weak acid or base in each of the following aqueous solutions: (a) a solution of HCLO with pH=4.60 (b) a solution of hydrazine, NH2NH2, with pH=10.20


Is there a way to solve this without Ka values? I looked up the Ka values and used them to solve and my answer was correct, but I'm wondering if that information would be provided to us on our exam... Should I be able to do this problem without being provided the Ka values?

Vincent Leong 2B
Posts: 207
Joined: Fri Aug 09, 2019 12:15 am

Re: 6D.7

Postby Vincent Leong 2B » Thu Jan 16, 2020 2:42 pm

You have to know the Ka value of both compounds to find the initial concentration. Given pH, you can only determine the concentration of H3O+, OH-, pOH, and probably other products but never the initial concentration by given just the solutions pH.

KBELTRAMI_1E
Posts: 108
Joined: Sat Jul 20, 2019 12:17 am

Re: 6D.7

Postby KBELTRAMI_1E » Thu Jan 16, 2020 2:58 pm

Can you solve for the Ka using pH? Like pKa is related to pH enough? Not sure


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