Pure water is added into the following solution causing a 10% increase in volume of each. The greatest percentage change in pH would be observed in which case (a), (b), (c) or (d)?

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$0.3 M {NH}_{3} - 0.2 M {NH}_{4}^{+}$ system

$0.2 M NaOH$

$0.4 M {CH}_{3} {COONH}_{4}$

$0.1 M {NaHCO}_{3}$

answer is B.

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Detailed Solution

Only (b) because pH of (a), (c), (d) are concentration independent.

So, the greatest percentage change in pH would be observed in which case $0.2 M NaOH$ .

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