What is the hydronium ion (H3O+) concentration in a solution at pH 5?
A. 5 × 105 M
B. 1 × 105 M
C. 1 × 10-5 M
D. 5 × 10-5 M
E. 2 × 10-1 M
C pH = -log [H3O+] , so 5 = -log [H3O+] = 1 × 10-5 M
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