Why is the pH of an aqueous solution of common salt approximately 7?
Answer and explanation
Correct answer: Because it is a salt of a strong acid and a strong base
The governing concept is the nature of salts formed from strong acids and strong bases. Common salt is sodium chloride, produced by the reaction of hydrochloric acid, a strong acid, with sodium hydroxide, a strong base. NaCl does not appreciably hydrolyse in water, so its aqueous solution is nearly neutral and has pH close to 7 at ordinary conditions. Therefore option A is correct; the other choices contradict its composition or solubility.
Frequently asked questions
What is the correct answer to this question?
Because it is a salt of a strong acid and a strong base
Why is this the correct answer?
The governing concept is the nature of salts formed from strong acids and strong bases. Common salt is sodium chloride, produced by the reaction of hydrochloric acid, a strong acid, with sodium hydroxide, a strong base. NaCl does not appreciably hydrolyse in water, so its aqueous solution is nearly neutral and has pH close to 7 at ordinary conditions. Therefore option A is correct; the other choices contradict its composition or solubility.
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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