You have four beakers A, B, C and D. Out of A and B one has hard water and the other has soft water. Out of C and D, one has soap solution, and the other has a detergent solution. How would you identify these liquids?
OR
A gas is liberated immediately with a brisk effervescence when you add acetic acid to sodium hydrogen carbonate powder in a test tube. Name the gas and describe the test that confirms the identity of the gas.
Soft water when mixed with soap or detergent forms lather but hard water when mixed with soap water does not form lather but form scum, but with detergent, it forms a lather.
OR
CH3COOH + NaHCO3 → CH3COONa + H2CO3 → CH3COONa + H2O + CO2↑
CO2 turns lime water milky.
Ca(OH)2 + CO2 → CaCO3 + H2O