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Q.

Washing soda (Na2CO2.10H2O) is widely used in softening of hard water. If 1 L of hard water requires 0.0143 g of washing soda. What is hardness of water in terms of ppm of CaCO3?

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Detailed Solution

MW of washing soda =286,MW of CaCO3=100gmol−1CaSO4+Na2CO3⟶CaCO3+Na2SO40.0143g of Na2CO3.10H2O=0.0143×102286=5×10 -3 gm of CaCO3Degree of hardness = 5×10-3×1061000=5ppm
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