The hardness of a water sample containing 10 - 3 M M g S O 4 expressed as C a C O 3 equivalents (in p p m ) is . (molar mass of M g S O 4 is 120.37 g / m o l )

Step-by-step solution

10 − 3 mole MgSO 4 = 10 − 3 mole of MgSO 4 present in 1L solutions. nCaCO 3 = nMgSO 4 ppm   In   term   of   CacO 3     = 10 − 3 × 100 1000 × 10 6   ppm In   term   of   CaCO 3 = 100     ppm Hard water is water that has high mineral content. Hard water is formed when water percolates through deposits of limestone, chalk or gypsum which are largely made up of calcium and magnesium carbonates, bicarbonates and sulfates