Question
Question: Pure water is added into the following solutions causing a 10% increase in volume of each. The great...
Pure water is added into the following solutions causing a 10% increase in volume of each. The greatest % change in pH would be observed in which case (1), (2), (3) or (4) ?
A
0.1 M NaHCO3
B
0.2 M NaOH
C
0.3 M NH3 – 0.2 M NH4+system
D
0.4 M CH3COONH4
Answer
0.2 M NaOH
Explanation
Solution
(1) pH of NaHCO3 is independent of dilution.
(3) pH of buffer solution is approximately remains constant with dilution.
(4) pH of salt of WA & WB is independent of dilution.