What mass of should be dissolved in sufficient water to get 20 m^3 of an aqueous solution of pH, 7.3, at 25°C?

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Question

What mass of $NaOH$ should be dissolved in sufficient water to get 20 m^3 of an aqueous solution of pH, 7.3, at 25°C?

Prashant Kotian · Accepted Answer

Correct answer: D. pH = 7.3 => pOH = 6.7 => total [OH-] = 2.0 * 10^-7 M. Accounting for water's contribution: [] = 1.5 * 10^-7 M. Moles = 1.5 * 10^-7 * 20000 = 3.0 * 10^-3 mol. Mass = 3.0 * 10^-3 * 40 = 0.12 g.

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