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Concentration of Solution

The Ca2+ conc...

Question

The $C a^{2 +}$ concentration and $M g^{2 +}$ concent-ration of a water sample are $160 m g / l i t$ and $40 m g / l i t$ as their ions respectively. The total hardness of this water sample in terms of $C a C O_{3}$ in $m g / l i t$ is approximately equal to

A

120

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B

567

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C

200

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D

267

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Solution

The correct option is B 567
Total hardness $= \frac{[M g^{2 +}] m g / l}{eq.wt.of M g} \times eq.wt. of C a C O_{3} + \frac{[C a^{2 +}] m g / l}{eq.wt.of C a} \times eq.wt. of C a C O_{3}$
$= \frac{40 \times 50}{12} + \frac{160 \times 50}{20}$
$= 166.67 + 400$
$= 566.67 ≃ 567 m g / l$

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Similar questions

Q. A water contains the following dissolved ions.

[N a^{+}] = 56 m g / L; [C a^{2 +}] = 40 m g / L;

[M g^{2 +}] = 30 m g / L; [A l^{3 +}] = 3 m g / L;

[H C O_{3}^{-}] = 190 m g / L; [C l^{-}] = 165 m g / L;

Water pH is 7.
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