What is the hydroxide ion concentration in an aqueous solution where the pH = 5?
A)The hydronium ion concentration equals 1 × .
B)The hydronium ion concentration equals 1 × .
C)The hydronium ion concentration equals 1 × .
D)The hydronium ion concentration equals 1 × .

Question

What is the hydroxide ion concentration in an aqueous solution where the pH = 5?
A)The hydronium ion concentration equals 1 × . 
B)The hydronium ion concentration equals 1 × . 
C)The hydronium ion concentration equals 1 × . 
D)The hydronium ion concentration equals 1 × .

Quizplus · Accepted Answer

The pH of 5 means that the concentration of hydronium ions is 10^-5M. Using the formula for the ion product constant of water (Kw = [H+][OH-] = 1x10^-14) we can calculate the concentration of hydroxide ions: [OH-] = Kw/[H+] = 1x10^-14/10^-5 = 1x10^-9M. Therefore, the hydroxide ion concentration is 1x10^-9M, which is equivalent to 1 × 10ea7cc8_da5a_f9e5_a2ab_c1911d403aad_TB2711_11.

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