Which of the following solution will have no effect on pH dilution?

Options

A. `0.3 M CH_3 COOK`
B. ` 0.4 M CH_3 COONH_4`
C. ` 0.2 MNH_4 OH+ 0.2 M NH_4 Cl`
D. ` 0.3 H_2CO_3 +0.3 M NaHCO_3`

Answer

B, C, D

Explanation

(a) ` pH = 7+ ((pKa+log c )/( 2 )) ` depends on C
(b) pH = 7 + ` ((pKa- pKb)/( 2 )) = 7 ` does not depend C
( c ) `pH =pKb + log ""(S)/(B) = pKb` doesnot depend on C
(d) `pH =pKa_1 + log "" (S)/(A) = pKa_1 `, doesnot depend on C