Question

Give chemical equation for washing soda removes permanent hardness of water,

Answer 1

Hardness of water means presence of salts of calcium and magnesium. This salt decrease the efficiency of cleansing action of soap.

To remove the hardness we used to add washing soda which result that calcium or magnesium ion react with Na2CO3 to form insolube compound (Ca or Mg ) which precipitates out.

Thus we get a soft water with no calcium or magnesium salts.for example,

calcium ions + sodium carbonate → calcium carbonate + sodium ions

Ca2+(aq) + Na2CO3(aq) → CaCO3(s) + 2Na+(aq)

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Answer 2

Sodium carbonate, Na2Co3 is also known as washing Soda. It can remove temporary and permanent hardness from water Sodium Carbonate is Soluble but Calcium Carbonate and magnesium carbonate are insoluble.

Ca2+(aq) + NaCo3(aq) ----- CuCo3(s) + 2Na+(aq).