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Hardness of Water and Treatment

Which of the ...

Question

Which of the following ions will cause hardness in water sample?

A

C a^{2 +}

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B

N a^{+}

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C

C l^{-}

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D

K^{+}

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Solution

The correct option is B $C a^{2 +}$
Presence of calcium and magnesium salts in the form of hydrogencarbonate, chloride and sulphate in water makes water 'hard'.

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Question 15

Which of the following ions will cause hardness in water sample?

(a) $C a^{2 +}$ (b) $N a^{+}$ (c) $C l^{-}$ (d) $K^{+}$

Q. Which of the following ions will cause hardness in water ?

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 $p H$ is $7$ .
Atomic weights:
$C a = 40, M g = 24, A l = 27, H = 1, C = 12, O = 16, N a = 23, C l = 35.5$

The non-carbonate hardness of the sample in $m g / L$ as $C a C O_{3}$ is

C a^{2 +}

concentration and

M g^{2 +}

concent-ration of a water sample are

160 m g / l i t

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}

m g / l i t

is approximately equal to

Q. Which of the following ions causes the hardness of water?

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