Hardness of a water sample is 100 ppm CaCO3. Thus, molarity of CaCO3 is

Question

Hardness of a water sample is 100 ppm CaCO3. Thus, molarity of CaCO3 is (A) 2 × 10-3 M (B) 1 × 10-3 M (C) 2 × 10-2 M (D) 2 × 10-4 M

Tardigrade Admin · Accepted Answer

Hard water has hardness = 100 ppm Thus, 106 mL (=103) water has CaCO3=100 g=1 mol Thus, molarity =( textMoles / textLitre) =(1/103)=1× 10-3 M

Q. Hardness of a water sample is 100 ppm $C a C O_{3}$ . Thus, molarity of $C a C O_{3}$ is