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Question
A salt X when dissolved in distilled water gives a clear solution which turns red litmus blue. Explain the phenomenon.
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Solution
When salt X is dissolved in distilled water, it produces a solution that turns red litmus paper blue, indicating the solution is basic (alkaline). This happens because salt X is formed from a strong base and a weak acid. In water, the salt anion undergoes hydrolysis, producing OH− ions and making the solution basic. Sodium carbonate (Na2CO3) dissolved in water gives a basic solution and turns red litmus blue.
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