100 mL of a water sample contains 0.81 g of calcium bicarbonate and 0.73 g of magnesium bicarbonate. The hardness of this water sample expressed in terms of equivalents of CaCO3 is (molar mass of calcium bicarbonate is 162 g mol−1 and magnesium bicarbonate is 146 g mol−1)
(a)
5,000 ppm
(b)
100 ppm
(c)
10,000 ppm
(d)
1,000 ppm
100 mL of a water sample contains 0.81 g of calcium bicarbonate and 0.73 g of magnesium bicarbonate. The hardness of this water sample expressed in terms of equivalents of CaCO3 is (molar mass of calcium bicarbonate is 162 g mol−1 and magnesium bicarbonate is 146 g mol−1)
(a)
5,000 ppm
(b)
100 ppm
(c)
10,000 ppm
(d)
1,000 ppm
Question ID - 52452 | SaraNextGen Top Answer
100 mL of a water sample contains 0.81 g of calcium bicarbonate and 0.73 g of magnesium bicarbonate. The hardness of this water sample expressed in terms of equivalents of CaCO3 is (molar mass of calcium bicarbonate is 162 g mol−1 and magnesium bicarbonate is 146 g mol−1)
(a)
5,000 ppm
(b)
100 ppm
(c)
10,000 ppm
(d)
1,000 ppm
|
100 mL of a water sample contains 0.81 g of calcium bicarbonate and 0.73 g of magnesium bicarbonate. The hardness of this water sample expressed in terms of equivalents of CaCO3 is (molar mass of calcium bicarbonate is 162 g mol−1 and magnesium bicarbonate is 146 g mol−1) |
|||
|
(a) |
5,000 ppm |
(b) |
100 ppm |
|
(c) |
10,000 ppm |
(d) |
1,000 ppm |
1 Answer
127 votes
Answer Key / Explanation : (c) -
Moles of Ca(HCO3)2 =0.005
Moles of Mg(HCO3)2 = 0.005
Hardness in terms of CaCO3 pm
=
= 
ppm
127 votes
Answer Link
127