Midterm Q3D

Science questions not covered in Chem 14A and 14B. Try to limit questions to chemistry (inorganic chemistry, physical chemistry, organic chemistry, biophysical chemistry, biochemistry, materials science, environmental chemistry).

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sharonvivianv
Posts: 63
Joined: Fri Apr 06, 2018 11:05 am

Midterm Q3D

Postby sharonvivianv » Sun Mar 17, 2019 2:22 am

Can someone help me figure out how to think through this questions. Thnx
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Matthew Tran 1H
Posts: 165
Joined: Fri Sep 28, 2018 12:16 am

Re: Midterm Q3D

Postby Matthew Tran 1H » Sun Mar 17, 2019 9:31 am

H3PO4 is a polyprotic acid, so it will have three deprotonations where it gives up H+. Ka2 is the acidity constant for the second deprotonation, so you have to use H2PO4- (it lost H+ in the first deprotonation, it may be helpful to write this reaction out too) and have it react with water, donating one H+ to form H3O+ and HPO42-. You can then find the expression for Ka2 from this reaction.
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