If a sample water has not supplied any heat and having impurities as follows: Mg(HCO3)2=50 mg of CaCO3, MgSO4 = 100mg of CaCO3, CaCl2=200mg of CaCO3, Ca(NO3)2=100mg of CaCO3. Calculate the lime required for treatment of 10000 litres of water.(a) 1.82Kg(b) 1.50Kg(c) 1.45Kg(d) 1.48KgI have been asked this question at a job interview.I need to ask this question from Problems, Units and Formulae in chapter Water of Applied Chemistry

If a sample water has not supplied any heat and having impurities as f

1.	If a sample water has not supplied any heat and having impurities as follows: Mg(HCO3)2=50 mg of CaCO3, MgSO4 = 100mg of CaCO3, CaCl2=200mg of CaCO3, Ca(NO3)2=100mg of CaCO3. Calculate the lime required for treatment of 10000 litres of water.(a) 1.82Kg(b) 1.50Kg(c) 1.45Kg(d) 1.48KgI have been asked this question at a job interview.I need to ask this question from Problems, Units and Formulae in chapter Water of Applied Chemistry
Answer» Right option is (d) 1.48Kg The BEST explanation: Lime NEEDED is 0.74[temp Ca HARDNESS+temp of MG hardness+perm Mg hardness]. So, 0.74(0+250+100)=148mg/litre. Lime REQUIREMENT for 10000 litres of water is 14810000mg=1.48Kg.

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