A sodium carbonate solution can turn red litmus blue. What type of salt is it?
Answer and explanation
Correct answer: A salt of a weak acid and a strong base
Sodium carbonate is produced from carbonic acid, a weak acid, and sodium hydroxide, a strong base. The carbonate ion reacts with water and generates hydroxide ions, so the solution is basic and turns red litmus blue. Therefore, option A is correct. A strong-acid/weak-base salt would usually be acidic, while a strong-acid/strong-base salt is approximately neutral.
Frequently asked questions
What is the correct answer to this question?
A salt of a weak acid and a strong base
Why is this the correct answer?
Sodium carbonate is produced from carbonic acid, a weak acid, and sodium hydroxide, a strong base. The carbonate ion reacts with water and generates hydroxide ions, so the solution is basic and turns red litmus blue. Therefore, option A is correct. A strong-acid/weak-base salt would usually be acidic, while a strong-acid/strong-base salt is approximately neutral.
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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