First slide

PH of strong acids and strong bases

Question

The pH of 0.1M solution of the following salts increases in the order

Moderate

A

NaCl < NH₄Cl < NaCN < HCl
B

HCl < NH₄Cl < NaCl < NaCN
C

NaCN < NH₄Cl < NaCl < HCl
D

HCl < NaCl < NaCN < NH₄Cl

Solution

HCl is a strong acid and its P^H < 3 NH₄Cl is a salt of weak base and strong acid. Such a salt has a P^H = $\frac{1}{2} [P^{K_{w}} - P^{K_{b}} - logC]$ or P^H < 7
NaCl is a neutral salt and such a salt solution has P^H = 7
NaCN is a salt of strong base and weak acid. Such a salt solution has a P^H given by
$P^{H} = \frac{1}{2} [P^{K_{w}} - P^{K_{b}} - logC]$ or P^H > 7

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