Why is ethanoic acid called a weak acid?
Answer and explanation
Correct answer: It ionises only partially in water
The governing concept is the extent of ionisation. Ethanoic acid, CH₃COOH, establishes a reversible equilibrium in water and only a fraction of its molecules release H⁺ ions: CH₃COOH ⇌ H⁺ + CH₃COO⁻. Hence option A is correct. Complete ionisation characterises a strong acid, while the metal and strong-base descriptions are chemically incorrect.
Frequently asked questions
What is the correct answer to this question?
It ionises only partially in water
Why is this the correct answer?
The governing concept is the extent of ionisation. Ethanoic acid, CH₃COOH, establishes a reversible equilibrium in water and only a fraction of its molecules release H⁺ ions: CH₃COOH ⇌ H⁺ + CH₃COO⁻. Hence option A is correct. Complete ionisation characterises a strong acid, while the metal and strong-base descriptions are chemically incorrect.
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.
