Among hydrochloric acid and ethanoic acid of equal concentration, which acid shows higher electrical conductivity and why?
Answer and explanation
Correct answer: Hydrochloric acid because it forms more ions
The governing concept is electrical conduction by mobile ions and the distinction between strong and weak acids. At equal concentration, hydrochloric acid ionises almost completely in water, producing many H3O+ and Cl− ions. Ethanoic acid is weak and only partially ionises, so it supplies fewer charge carriers. Consequently HCl has higher conductivity, making option A correct. Equal labels as acids do not imply equal ionisation, and option B contradicts the stated equal concentration.
Frequently asked questions
What is the correct answer to this question?
Hydrochloric acid because it forms more ions
Why is this the correct answer?
The governing concept is electrical conduction by mobile ions and the distinction between strong and weak acids. At equal concentration, hydrochloric acid ionises almost completely in water, producing many H3O+ and Cl− ions. Ethanoic acid is weak and only partially ionises, so it supplies fewer charge carriers. Consequently HCl has higher conductivity, making option A correct. Equal labels as acids do not imply equal ionisation, and option B contradicts the stated equal concentration.
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.
