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Hardness of Water and Treatment

The reaction ...

Question

The reaction involved during the removal of temporary hardness of water is

A

Ca(HCO3)2 --heat→ CaCO3 + H2O + CO2 ↑

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B

CaCl2 + Na2CO3 → CaCO3 ↓ + 2NaCl

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C

MgSO4 + Na2Al2Si2O8.xH2O → MgAl2Si2O8.xH2O + Na2SO4

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D

2CaCl2 + (NaPO3)6 → Na2[Ca2(PO3)6] + 4NaCl

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Solution

The correct option is A
Ca(HCO3)2 --heat→ CaCO3 + H2O + CO2 ↑

Temporary hardness of water is due to bicarbonates of Ca and Mg

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Similar questions

Q. Permanent hardness is due to

S O_{4}^{2 -}

C l^{-}

C a^{2 +}

M g^{2 +}

and is removed by the addition of

N a_{2} C O_{3}

.

C a S O_{4} + N a_{2} C O_{3} ⟶ C a C O_{3} + N a_{2} S O_{4}

C a C l_{2} + N a_{2} C O_{3} ⟶ C a C O_{3} + 2 N a C l

100

C a C O_{3}

N a_{2} C O_{3}

required to soften

10

L of hard water is :

Q. Permanent hardness is due to

C l^{⊝}

S O_{4}^{2 -}

M g^{2 +}

C a^{2 +}

and is removed by adding

N a_{2} C O_{3}

C a S O_{4} + N a_{2} C O_{3} \to C a C O_{3} + N a_{2} S O_{4}

C a C l_{2} + N a_{2} C O_{3} \to C a C O_{3} + 2 N a C l

Which of the following statements is/are correct?

Q. A process designed to remove organic sulphur from coal prior to combustion involves the reaction.

X - S - Y + 2 N a O H \to X - O - Y + N a_{2} S + H_{2} O

C a C O_{3} \to C a O + C O_{2}

N a_{2} S + C O_{2} + H_{2} O \to N a_{2} C O_{3} + H_{2} S

C a O + H_{2} O \to C a (O H)_{2}

N a_{2} C O_{3} + C a (O H)_{2} \to C a C O_{3} + 2 N a O H

In the processing of 320 metric tons of a coal having 1.0% sulphur content, how much limestone

(C a C O_{3})

must be edecomposed to provide enough

C a (O H)_{2}

to regenerate the NaOH used in the original leaching step?

Following reaction is used to remove temporary hardness which is due to dissolved bicarbonates of

C a^{2 +}

M g^{2 +}

C a (H C O_{3})_{2} + C a (O H)_{2} \to 2 C a C O_{3} ↓ + 2 H_{2} O

Actually lime (

C a O

) is added which in

H_{2} O

C a (O H)_{2}

and precipitates

C a C O_{3}

C a O + H_{2} O \to C a (O H)_{2}

10

L of hard water requires

0.56

C a O

, temporary hardness of

C a C O_{3}

x \times 10^{2}

x

Q. The reaction(s) involved in the removal of temporary hardness of water by heating is/are:

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