Calculate amount of lime (90% pure) and soda (98% pure) for the treatment of one million litres of water containing Ca(HCO3)2=8.1 ppm , 𝐶𝑎𝐶𝑙2= 33.3 ppm, 𝐻𝐶𝑂3- =91.5 ppm,  𝑀𝑔𝐶𝑙2 = 38 ppm ,M𝑔(𝐻𝐶𝑂3)2 =14.6 ppm .The coagulant 𝐴𝑙2(𝑆𝑜4)3 was added at the rate of 17.1 ppm

Calculate the amount of lime and soda required per litre for chemical treatment of water containing: CaCO3 =80 ppm; MgCO3=32 ppm; HCO3-=195 ppm; Fe SO4.7H2O added as coagulants=73.5 ppm. The purity of lime is 92% and soda is 84%.

Calculate quantities of lime and soda required for softening of 20,000 litres of water containing following salts in ppm (16.4 ppm NaAlO2 used as a coagulant) Ca+2 = 160 ppm Mg+2 = 72 ppm HCO3 – = 73.2 ppm CO2 = 44 ppm Al2(SO4)3 = 34.2 ppm HCl = 36.5 ppm.a.Lime = 7.84 mg, Soda = 15.05 mgb.Lime = 7.84 g, Soda = 15.05 gc.None of thesed.Lime = 7.84 kg, Soda = 15.05 kg

A water sample contains the following: Ca2+=120 ppm, Mg2+=120 ppm, CO2=132 ppm, HCO3-=122 ppm and K+=40 ppm. Calculate the amount of lime 80% pure and soda 90% pure for softening of 106 litres of water.

A water sample using FeSO4.7H20 as a coagulant at the rate of 139 ppm, gave the following results for raw water: Ca2+=320 ppm; Mg2+=120 ppm, CO2=88ppm; HCO3-=732 ppm. Calculate the lime and soda required for softening of 1000 litres of raw water.

alculate the hardness in terms of CaCO3 Equivalent if 81 mg/l Ca(HCO3)2 is present in water sample. a.50 mg/lb.20 mg/lc.40 mg/ld.81 mg/l