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Pure water is added into the following s...

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) ?

A

0.1 M `NaHCO_3`

B

0.2 M NaOH

C

0.3 M `NH_3-0.2 M NH_4^(-)` system

D

0.4 M `CH_3COONH_4`

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The correct Answer is:
b
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