First slide

Salt hydrolysis :

Question

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

Easy

A

$\large NaCl\, < \,N{H_4}Cl\, < \,NaCN\, < \,HCl$
B

$HCl\, < \,N{H_4}Cl\, < \,NaCl\, < NaCN$
C

$NaCN\, < \,N{H_4}Cl\, < \,NaCl\, < \,HCl$
D

$HCl\, < \,NaCl\, < \,N{H_4}Cl\, < \,NaCN$

Solution

$HCl\, < \,N{H_4}Cl\, < \,NaCl\, < NaCN$

HCl is a strong acid
NH₄Cl is a salt of strong acid & weak base and so its
$\large PH < 7\left[ {{P^H} = \frac{1}{2}\left[ {{P^{{K_w}}} - {P^{{K_b}}} - \log C} \right]} \right]$
P^H of NaCl solution is 7 at 25^oC.
NaCN is a slat of strong base & weak acid and so its
$\large PH > 7\left[ {{P^H} = \frac{1}{2}\left[ {{P^{{K_w}}} + {P^{Ka}} + \log C} \right]} \right]$

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