Equal volumes of acid and base were mixed but the solution remained acidic. What is the most suitable reason?
Answer and explanation
Correct answer: The acid was more concentrated or stronger
The governing concept is that neutralisation depends on the reacting amounts of H⁺ and OH⁻, not simply on the measured volumes. Equal volumes can contain different concentrations, and acids or bases can differ in strength and degree of ionisation. If the acid supplies more effective H⁺ than the base can remove through OH⁻, excess acid remains and the mixture stays acidic. Therefore A is the best reason.
Frequently asked questions
What is the correct answer to this question?
The acid was more concentrated or stronger
Why is this the correct answer?
The governing concept is that neutralisation depends on the reacting amounts of H⁺ and OH⁻, not simply on the measured volumes. Equal volumes can contain different concentrations, and acids or bases can differ in strength and degree of ionisation. If the acid supplies more effective H⁺ than the base can remove through OH⁻, excess acid remains and the mixture stays acidic. Therefore A is the best reason.
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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