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pH of Salts

A salt is dis...

Question

A salt is dissolved in water and the pH of this salt solution is measured with a universal indicator paper. If the pH of solution is less than 7, the salt is most likely to be:
(a) CH₃COONa
(b) Na₂CO₃
(c) KCl
(d) NH₄Cl

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Solution

(d) NH₄Cl

NH₄Cl is formed from a weak base, ammonium hydroxide (NH₄OH), and a strong acid, hydrochloric acid (HCl). On hydrolysis, NH₄Cl forms more H⁺ ions than OH^- ions. Thus, it is acidic, with a pH less than 7.

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