Midterm

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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megangeorge-1K
Posts: 59
Joined: Thu Feb 01, 2018 3:01 am

Midterm

Postby megangeorge-1K » Wed Feb 20, 2019 4:23 pm

I have a question about Question 3D
What is Ka2?

dgerges 4H
Posts: 65
Joined: Fri Sep 28, 2018 12:24 am

Re: Midterm

Postby dgerges 4H » Wed Feb 20, 2019 4:25 pm

it's the second deprotonation of h3po4
the first would include h2po4- in the product, the second will include hpo4^2- in the product

Gillian Murphy 2C
Posts: 30
Joined: Fri Sep 28, 2018 12:22 am

Re: Midterm

Postby Gillian Murphy 2C » Wed Feb 20, 2019 4:29 pm

Ka2 is the Ka for taking away the second hydrogen in H3PO4

the reaction would be

H2PO4(-) + H2O = HPO4(2-) + H3O(+)

and Ka2 would be

(HPO4(2-)*H3O(+))/H2PO4(-)

juliasloan_4g
Posts: 67
Joined: Fri Sep 28, 2018 12:28 am

Re: Midterm

Postby juliasloan_4g » Wed Feb 20, 2019 5:55 pm

Ka2 is the second deprotonation, when an acid is polyprotic and can give away multiple hydrogens

Jeannine 1I
Posts: 73
Joined: Fri Sep 28, 2018 12:27 am

Re: Midterm

Postby Jeannine 1I » Wed Feb 20, 2019 10:34 pm

Does anyone know how you would've figured out the oxidation states of the reactants and products involved?

Casandra
Posts: 65
Joined: Fri Sep 28, 2018 12:17 am

Re: Midterm

Postby Casandra » Wed Feb 20, 2019 10:38 pm

Ka2 is the second deprotonation of phosphoric acid


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