Explain with equations and calculate the quantity of quick lime and soda ash required to soften 30,000 litres of water containing: (i) 290 ppm of magnesium bicarbonate and 211 ppm of sodium chloride: (ii) 30 pm of Mg and 11.3 of HCO3-  (iii)2.5 ppm of the free acids, 150 ppm of sulphate ions and  79 ppm of chloride ions.

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