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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 ______.
Options
CH3COONa
Na2CO3
KCl
NH4Cl
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Solution
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 NH4Cl.
Explanation:
A pH of less than 7 indicates the solution is acidic, characteristic of an acidic salt. Ammonium chloride (NH4Cl) is formed from a strong acid (HCl) and a weak base (NH4OH). In water, ammonium ions undergo cationic hydrolysis, releasing excess hydronium ions (H3O+), thereby lowering the pH and turning the universal indicator paper yellow, orange, or red.
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