100 ml of a water sample contains 0.81 gm of calcium bicarbonate and 0.73 gm of magnesium bicarbonate. the hardness of this water sample.

100 ml of a water sample contains 0.81 gm of calcium bicarbonate and 0.73 gm of magnesium bicarbonate. the hardness of this water sample expressed in terms of equivalents of CaCO₃ is:
(molar mass of calcium bicarbonate is 162g mol−1 and magnesium bicarbonate is 146gmol−1)

Answers (1)

L Lovekush Kumar Saini

$\begin{array}{l} n_{e q} \cdot C a C O_{3}=n_{e q}. C a\left(H C O_{3}\right)_{2}+ n_{e q}. M g\left(H C O_{3}\right)_{2} \end{array}$

$\begin{array}{l} \text { or } \frac{W}{100} \times 2=\frac{0.81}{162} \times 2+\frac{0.73}{146} \times 2 \\ \therefore w=1.0 \\ \therefore \text { Hardness }=\frac{1.0}{100} \times 10^{6}=10000 p p m \end{array}$

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100 ml of a water sample contains 0.81 gm of calcium bicarbonate and 0.73 gm of magnesium bicarbonate. the hardness of this water sample expressed in terms of equivalents of CaCO3​ is: (molar mass of calcium bicarbonate is 162g mol−1 and magnesium bicarbonate is 146gmol−1)

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100 ml of a water sample contains 0.81 gm of calcium bicarbonate and 0.73 gm of magnesium bicarbonate. the hardness of this water sample expressed in terms of equivalents of CaCO₃ is:
(molar mass of calcium bicarbonate is 162g mol−1 and magnesium bicarbonate is 146gmol−1)