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.
CH3COOH + NaHCO3 → CH3COONa + H2CO3 → CH3COONa + H2O + CO2↑
CO2 turns lime water milky.
Ca(OH)2 + CO2 → CaCO3 + H2O
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