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A $75 mL$ solution that is $0.10 M$ in ${HC}_{2} H_{3} O_{2}$ $0.10 M$ in ${NaC}_{2} H_{3} O_{2}$ has a pH of $4.74 .$ Which of the following actions will change the pH of this solution?
(P) Adding 15 mL of $0.10 M HCl$
(Q) Adding $0.010 mol$ of ${NaC}_{2} H_{3} O_{2}$
(R) Diluting the solution from 75 mL to 125 mL

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P only

Q only

P and Q only

P, Q and R

answer is C.

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Detailed Solution

$p K_{a} = 4.74$ Addition of water does not affect the pH.

Thus, Adding 15 mL of $0.10 M HCl$ or adding $0.010 mol$ of ${NaC}_{2} H_{3} O_{2}$ will change the pH of this solution while diluting the solution from 75 mL to 125 mL does not.

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