[Single-digit Integer] The ionic product of heavy water, , is 1.0 × 10^-16 at 7°C. The pD value of pure heavy water at 7°C is

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Question

[Single-digit Integer] The ionic product of heavy water, $D_2O$, is 1.0 × 10^-16 at 7°C. The pD value of pure heavy water at 7°C is

Prashant Kotian · Accepted Answer

Correct answer: 0008. In pure heavy water: [D+] = [OD-].
KD2O = [D+][OD-] = 1.0 × 10^-16 at 7°C.
Therefore, [D+]^2 = 1.0 × 10^-16 => [D+] = 1.0 × 10^-8 M.
pD = -log[D+] = 8.

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