How is the gas formed in the reaction between sodium carbonate and dilute hydrochloric acid identified?
Answer and explanation
Correct answer: By turning lime water milky
A carbonate reacts with hydrochloric acid to produce sodium chloride, water, and carbon dioxide: Na2CO3 + 2HCl → 2NaCl + H2O + CO2. Carbon dioxide passed through limewater forms insoluble calcium carbonate, making the limewater milky. Thus option A is the confirmatory observation. A pop sound is the test for hydrogen, while litmus change and a yellow precipitate are not the standard identification tests for carbon dioxide.
Frequently asked questions
What is the correct answer to this question?
By turning lime water milky
Why is this the correct answer?
A carbonate reacts with hydrochloric acid to produce sodium chloride, water, and carbon dioxide: Na2CO3 + 2HCl → 2NaCl + H2O + CO2. Carbon dioxide passed through limewater forms insoluble calcium carbonate, making the limewater milky. Thus option A is the confirmatory observation. A pop sound is the test for hydrogen, while litmus change and a yellow precipitate are not the standard identification tests for carbon dioxide.
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.
