Why is an aqueous solution of sodium chloride nearly neutral?
Answer and explanation
Correct answer: Because it is a salt of a strong acid and a strong base
Sodium chloride is formed by the neutralisation of hydrochloric acid, a strong acid, with sodium hydroxide, a strong base: HCl + NaOH → NaCl + H2O. In water, NaCl dissociates into Na+ and Cl−, but these ions do not significantly hydrolyse to produce excess H+ or OH−. Consequently, the solution has a pH close to 7, so option A is correct.
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?
Sodium chloride is formed by the neutralisation of hydrochloric acid, a strong acid, with sodium hydroxide, a strong base: HCl + NaOH → NaCl + H2O. In water, NaCl dissociates into Na+ and Cl−, but these ions do not significantly hydrolyse to produce excess H+ or OH−. Consequently, the solution has a pH close to 7, so option A is correct.
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.
