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An aqueous solution of salt is alkaline. This shows that salt is made from:

1. a strong acid and a strong base
2. a strong acid and a weak base
3. a weak acid and a weak base
4. a weak acid and a strong base

Correct answer: a weak acid and a strong base

Solution

A salt solution is alkaline when the anion reacts with water to produce OH⁻. That happens when the salt comes from a weak acid and a strong base, because the weak acid’s conjugate base is basic in water.

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