Bright Tutorials Bright Tutorials
ICSE Class 8 Chemistry Question 2 of 17

Carbon & Its Compounds — Question 6

Back to all questions
6
Question

Question 15

'When carbon dioxide is bubbled into lime water, the lime water turns milky and when bubbled in excess the milkiness disappears'. Give balanced equations to support the statement.

Answer

When carbon dioxide is bubbled into lime water, the lime water turns milky due to the formation of insoluble calcium carbonate.

Ca(OH)2 + CO2 ⟶ CaCO3 ↓ + H2O

When CO2 is bubbled in excess the milkiness disappears due to the formation of soluble calcium bicarbonate [Ca(HCO3)2]

CaCO3 + H2O + CO2 ⟶ Ca(HCO3)2