Calculate the hydroxide ion concentration in an aqueous solution with a pH of 9.85 at 25°C.
A) 7.1 × 10-5 M
B) 4.2 × 10-10 M
C) 8.7 × 10-10 M
D) 6.5 × 10-5 M
E) 1.4 × 10-10 M
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