Calculate the values of [H+] and [OH-] in a neutral solution at 25 0c .

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Explanation: 

By defination ,in a neutral solution [H+] equals [OH-] .Let's call the concentration of each of these species in neutral solution x .Using equation

             Kw = [H+] [OH-]

 1.0 x 10-14   = x . x  = x 2

x = 1.0 x 10-7  = [H+] = [ OH-] 

In an acid solution [H+] is greater then 1.0 x 10-7 M , in a baisc solution [H+] is less than 1.0 x 10-7 M .

Answer: 

1.0 x 10-7

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