Homework 12.21

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Glenda Marshall DIS 3M
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Homework 12.21

Postby Glenda Marshall DIS 3M » Thu Dec 11, 2014 10:52 pm

In problem 12.21, I understand that the ratio of CO3 and HCO3 is related by the HH equation. However, in the answer it uses a pKa2 value. I know this value is necessary to solve the problem, so I am curious how I find it without numerical values given in the problem.

HelenMach 1J
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Re: Homework 12.21

Postby HelenMach 1J » Sat Dec 13, 2014 12:43 pm

The value of pKa2 is given on page 455, Table 11.10. I don't believe you are required to figure this value out yourself, especially since there were no values given to you in order to do so... I believe...

saialam 1A
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Re: Homework 12.21

Postby saialam 1A » Sat Dec 13, 2014 2:34 pm

Yea for questions like these we would be given the Pka especially when it comes to polyprotic acids.

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Re: Homework 12.21

Postby Chem_Mod » Sat Dec 13, 2014 10:55 pm

if this were a test question you would be given pka1 and pka2. It would be up to you to figure out which to use.

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