Question

Hardness is defined as calcium and magnesium ion content. Since most hardness iscaused by carbonate mineral deposits and does not distinguish calcium and magnesiumions, hardness is usually reported as parts per million (ppm) of calcium carbonate(CaCO3, by weight). A water supply with a hardness of 100 ppm contains the equivalentof 100 g of CaCO3 in 1 million g of water or 0.1 g in 1 L of water (or 1000 g of watersince the density of water is about 1 g/mL). For a water supply with a hardness 134 ppm,what is its hardness in mol/L?

Answer 1

Therefore, the hardness of the water in mol/L is 0.00134 mol/L

Step-by-step explanation:

100ppm = 0.1g/L

134ppm = 134 × 0.1/100 = 0.134 g/L

Concentration in mol/L = (Concentration in g/L)/(molar mass)

Molar mass of CaCO₃ = 100.1 g/mol

Concentration In mol/L = 0.134/100.1 = 0.00134 mol/L

Therefore, the hardness of the water in mol/L is 0.00134 mol/L

Hope this Helps!!!