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  4. Hard water is not fit for washing clothes because:

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Q. Hard water is not fit for washing clothes because:

BVP MedicalBVP Medical 2001

Solution:

Hard water contains dissolved salts of calcium, magnesium or iron, which form insoluble precipitate with soap. $ \underset{Soap}{\mathop{2RCOONa}}\,+C{{a}^{2+}}\xrightarrow{{}}\underset{\text{Insoluble}}{\mathop{{{(RCOO)}_{2}}Ca}}\,+2N{{a}^{+}} $