Give reason
(a) Lime water turns milky on passing carbon dioxide gas into it.
(b) Bubbles are produced when acetic acid is added to a solution of sodium hydrogen carbonate.
Answers
Explanation:
1. Lime water is a saturated solution of calcium hydroxide(Ca(OH2). When carbon dioxide is passed through it, a precipitate of calcium carbonate (CaCO3)of white colour is formed.
Ca(OH)2 (aq) + CO2 (g) -> CaCO3 (Ppt) H2O
2.The formula of acetic acid is CH3COOH and the formula of sodium hydrogen carbonate is NAHCO3. When they are mixed they react and produce carbon dioxide gas that erupts out as bubbles from the solution producing water also. The formula is CH3COOH + NAHCO3 = CH3COONA + H2O + CO2.
Answer:
a.)When CO2 passes through lime water, it turns into milky lime water due to formation of insoluble calcium carbonate.
Ca(OH)2+CO2⇌CaCO3 + H2O
b.)Carbon dioxide' is evolved due to the chemical reaction between 'acetic acid' and 'sodium hydrogen carbonate'. The reaction of this statement is,
NaHCO3+CH3COOH→Na2CO3+H2O+CO2