Agroundwater contains the following constituents: co2 9.6 mg/l mg2+ 25.8 mg/l hco, ca2+ 95.2 mg/l 198 mg/l as caco. the facility is to treat 50 x 106 l/d of water from this source using lime-soda ash to reduce the hardness. determine the quicklime and soda ash dosages for softening. assume the lime is 90% cao by weight and the soda ash is 97% pure sodium carbonate.