When a solution of NH_4Cl is diluted,its pH . | vedclass

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(B) $NH_4Cl$ is a salt of a strong acid $(HCl)$ and a weak base $(NH_4OH)$.The hydrolysis of $NH_4^+$ ion is given by: $NH_4^+ + H_2O \rightleftharpoo

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increases.

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(B) $NH_4Cl$ is a salt of a strong acid $(HCl)$ and a weak base $(NH_4OH)$.The hydrolysis of $NH_4^+$ ion is given by: $NH_4^+ + H_2O \rightleftharpoons NH_4OH + H^+$.The concentration of $H^+$ ions is given by the formula: $[H^+] = \sqrt{\frac{K_w \cdot K_h}{C}} = \sqrt{\frac{K_w}{K_b} \cdot C}$.As the solution is diluted,the concentration $C$ decreases.Since $[H^+] \propto \sqrt{C}$,the concentration of $H^+$ ions decreases upon dilution.As $[H^+]$ decreases,the $pH$ $(pH = -\log[H^+])$ increases.

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