If equal volumes of acid and base are mixed but the solution remains acidic, which reason may be correct?
Answer and explanation
Correct answer: The acid had more effective hydrogen ions
Neutralisation is governed by the amounts and effective concentrations of H⁺ and OH⁻, not simply by the volumes poured. Equal volumes can contain unequal mole amounts if the solutions have different concentrations, and a weak base may also provide fewer effective OH⁻ ions than a strong acid provides H⁺ ions. If H⁺ remains in excess after reaction, the final solution is acidic. Thus option A is correct.
Frequently asked questions
What is the correct answer to this question?
The acid had more effective hydrogen ions
Why is this the correct answer?
Neutralisation is governed by the amounts and effective concentrations of H⁺ and OH⁻, not simply by the volumes poured. Equal volumes can contain unequal mole amounts if the solutions have different concentrations, and a weak base may also provide fewer effective OH⁻ ions than a strong acid provides H⁺ ions. If H⁺ remains in excess after reaction, the final solution is acidic. Thus option A is correct.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
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