Equal volumes of acid and base are mixed, yet the solution remains basic. What is the most suitable reason?
Answer and explanation
Correct answer: The base was more concentrated or stronger
The governing idea is that neutralisation compares reacting amounts, not just liquid volumes. Equal volumes of an acid and a base may contain unequal concentrations of ions. A more concentrated or stronger base can provide more hydroxide ions than the acid can neutralise. After the reaction, excess hydroxide ions remain, so the mixture has a pH above 7 and is basic. Option C is wrong because equal volume has no fixed pH, while D is wrong because acid-base neutralisation commonly forms water along with salt.
Frequently asked questions
What is the correct answer to this question?
The base was more concentrated or stronger
Why is this the correct answer?
The governing idea is that neutralisation compares reacting amounts, not just liquid volumes. Equal volumes of an acid and a base may contain unequal concentrations of ions. A more concentrated or stronger base can provide more hydroxide ions than the acid can neutralise. After the reaction, excess hydroxide ions remain, so the mixture has a pH above 7 and is basic. Option C is wrong because equal volume has no fixed pH, while D is wrong because acid-base neutralisation commonly forms water along with salt.
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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