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.

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Answer:             1.0  × 10⁻⁵ msolution:                     as we know ph is given as,                                    ph  = -log [h⁺]and,                                    [h⁺]  =  10^-ph    (1)putting value of ph in eq. 1,                                    [h⁺]  =  10⁻⁵                                    [h⁺]  =  1.0  × 10⁻⁵ m