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A solution contains \( 10 \mathrm{mL} \) of \( 0.1 \mathrm{N} \) NaOH and \( 10 \mathrm{mL} \) of \( 0.05 \mathrm{Na}_{2} \mathrm{SO}_{4} . \) pH of this solution is

1. equal to 7
2. less than 7
3. greater than 7
4. zero

Correct answer: greater than 7

Solution

NaOH is a strong base, so its hydroxide ions remain in solution and make the mixture alkaline. Sodium sulfate is essentially a neutral salt in this context and does not cancel the base, so the final pH is above 7.

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