Question

calculate the lime and soda required to soften 10000 litres of water sample having calcium hardness is equal to 450 mg oblique 1 aisi sol 3

Answer 1

Explanation:

Multiply alkalinity in "Eq/L" by the equivalent weight of CaCO3 to calculate it in g/L. In our example, Alkalinity as CaCO3 = 0.0097 Eq/L x 50 g/Eq = 0.485 g/L = 485 mg/L. Thus, if the solution density is close or equal to 1, then ppm = mg/L.Water is softened on a large scale by the addition of just enough lime to precipitate the calcium as carbonate and the magnesium as hydroxide, whereupon sodium carbonate is added to remove the remaining calcium salts.