7th edition 6.57


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paytonm1H
Posts: 74
Joined: Fri Sep 28, 2018 12:18 am

7th edition 6.57

Postby paytonm1H » Sat Mar 09, 2019 8:55 pm

6.57 asks for the Ka value for HF given the two half reaction reduction potentials. After calculating K using the Nernst equation, the solutions manual takes the square root of K to get the Ka value. Can someone explain why they do this?
Thanks!

Matthew Tran 1H
Posts: 165
Joined: Fri Sep 28, 2018 12:16 am

Re: 7th edition 6.57

Postby Matthew Tran 1H » Sun Mar 10, 2019 7:03 pm

They take the square root because K is for the reaction 2HF --> 2H+ + 2F-, but Ka is for the reaction HF <--> H+ + F-. Since the reaction for Ka is half of that of K, Ka is the square root of K.


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