Question

Calculate [H+] for each of the following solutions A) [OH−]= 3.9×10−4 M B) [OH−]= 8.3×10−9 M...

Calculate [H+] for each of the following solutions

A) [OH−]= 3.9×10−4 M

B) [OH−]= 8.3×10−9 M

C) A solution in which [OH−] is 140 times greater than [H+]

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Homework Answers

Answer #1

the H+ ion concnetration is can be calculate as fololows

a) [H+] = Kw / [OH-]

[H+] = 1.0*10-14 / [OH-]

[H+] = 1.0*10-14 / 3.9*10-4

        = 2.564*10-11 M

b) [H+] = 1.0*10-14 / [OH-]

     [H+] = 1.0*10-14 /8.3*10-9

                 = 1.2048*10-6 M

c) OH- is 140 times greater so [OH-] = 140 [H+]

   so 1.0*10-14 = [H+] * 140 [H+]

=> [H+]2 = 1.0*10-14 / 140

=> [H+] = 8.45*10-9 M

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