pH of 10⁻⁸ M HCl solution (in water):
ALess than 7
B8
CCannot determine
DClose to 7 (autoionization of water dominates at this low H⁺ concentration)
Answer & Solution
Correct answer: A. Less than 7
At 10⁻⁸ M HCl, must include water's H⁺ from autoionization (10⁻⁷ M). Total H⁺ ≈ 10⁻⁷ + 10⁻⁸ = 1.1 × 10⁻⁷ M. pH ≈ 6.96, slightly less than 7.
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