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.

To calculate the amount of lime and soda required for softening of water, we need to consider the hardness caused by Ca2+, Mg2+, CO2, and HCO3-.

1. Calculate the hardness caused by Ca2+ and Mg2+: Ca2+ hardness = 120 ppm = 120 mg/L Mg2+ hardness = 120 ppm = 120 mg/L

2. Convert the hardness into CaCO3 equivalents: Ca2+ hardness as CaCO3 = 120 mg/L * (100/40) = 300 mg/L Mg2+ hardness as CaCO3 = 120 mg/L * (100/24.3) = 493.83 mg/L

3. Calculate the hardness caused by CO2 and HCO3-: CO2 hardness = 132 ppm = 132 mg/L HCO3- hardness = 122 ppm = 122 mg/L

4. Convert the hardness into CaCO3 equivalents: CO2 hardness as CaCO3 = 132 mg/L * (100/44) = 300 mg/L HCO3- hardness as CaCO3 = 122 mg/L * (100/61) = 200 mg/L

5. Calculate the total hardness: Total hardness = Ca2+ hardness as CaCO3 + Mg2+ hardness as CaCO3 + CO2 hardness as CaCO3 + HCO3- hardness as CaCO3 Total hardness = 300 mg/L + 493.83 mg/L + 300 mg/L + 200 mg/L = 1293.83 mg/L

6. Calculate the amount of lime required: Lime required = Total hardness * Volume of water / Purity of lime Lime required = 1293.83 mg/L * 106 L / 80% Lime required = 171.84 g

7. Calculate the amount of soda required: Soda required = (Ca2+ hardness as CaCO3 + Mg2+ hardness as CaCO3) * Volume of water / Purity of soda Soda required = (300 mg/L + 493.83 mg/L) * 106 L / 90% Soda required = 94.14 g

So, 171.84 g of lime and 94.14 g of soda are required for softening of 106 litres of water.