Question

Calculate [H3O+] and [OH−] for each of the following solutions. A) pH= 8.60 B) pH= 2.89

Calculate [H3O+] and [OH−] for each of the following solutions.

A) pH= 8.60

B) pH= 2.89

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Homework Answers

Answer #1

A) pH= 8.60

    -log[H^+]   = 8.6

        log[H^+]   = -8.6

          [H^+]    = 10^-8.6    = 2.5*10^-9 M

Kw   = [H^+][OH^-]

[OH^-]   = Kw/[H^+]  

                = 10^-14/2.5*10^-9   = 4*10^-6 M

B) pH= 2.89

-log[H^+]   = 2.89

    log[H^+]   = -2.89

          [H^+]    = 10^-2.89 = 0.0013M

Kw   = [H^+][OH^-]

[OH^-]   = Kw/[H^+]  

                = 10^-14/0.0013 = 7.7*10^-12M

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