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Question
Which of the following salts will give an aqueous solution having pH of almost 7?
Options
NH4NO3
NH4Cl
CaCl2
KCl
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Solution
KCl
Explanation:
KCl is a neutral salt formed from a strong acid (HCl) and a strong base (KOH). When dissolved in water, it completely dissociates into K+ and Cl− ions. Since these ions do not react with water (do not undergo hydrolysis), the natural balance of H+ and OH− ions in water remains undisturbed. This is why an aqueous solution of KCl shows a pH of exactly 7.
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