Why does mixing equal volumes of an acid and a base not always produce a neutral solution?
Answer and explanation
Correct answer: Because their concentration and strength may be different
Neutralisation depends on the amounts of reactive hydrogen ions and hydroxide ions, not simply on the measured volumes. Equal volumes may contain unequal concentrations, and weak or strong acids and bases may provide different effective ion amounts. For example, the same volume of 1 M acid and 0.1 M base will not neutralise completely. Therefore option A is correct; the other statements deny or misdescribe neutralisation.
Frequently asked questions
What is the correct answer to this question?
Because their concentration and strength may be different
Why is this the correct answer?
Neutralisation depends on the amounts of reactive hydrogen ions and hydroxide ions, not simply on the measured volumes. Equal volumes may contain unequal concentrations, and weak or strong acids and bases may provide different effective ion amounts. For example, the same volume of 1 M acid and 0.1 M base will not neutralise completely. Therefore option A is correct; the other statements deny or misdescribe neutralisation.
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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