Sodium carbonate solution is basic and gives a gas with acid. How will this gas be identified?
Answer and explanation
Correct answer: It will turn lime water milky
Sodium carbonate reacts with an acid to release carbon dioxide: Na₂CO₃ + 2HCl → 2NaCl + H₂O + CO₂. Carbon dioxide is identified by passing it through limewater, where it reacts with calcium hydroxide to form insoluble calcium carbonate, making the limewater milky. A pop sound is the test for hydrogen, not carbon dioxide. Litmus and turmeric describe general acid-base behaviour and are not the specific gas test required here.
Frequently asked questions
What is the correct answer to this question?
It will turn lime water milky
Why is this the correct answer?
Sodium carbonate reacts with an acid to release carbon dioxide: Na₂CO₃ + 2HCl → 2NaCl + H₂O + CO₂. Carbon dioxide is identified by passing it through limewater, where it reacts with calcium hydroxide to form insoluble calcium carbonate, making the limewater milky. A pop sound is the test for hydrogen, not carbon dioxide. Litmus and turmeric describe general acid-base behaviour and are not the specific gas test required here.
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.
