First slide

Hardness of water

Question

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

Easy

A

$\large Ca{(HC{O_3})_{2\;}}\xrightarrow{{\;\;\;\Delta \;\;\;}}CaC{O_3}\; + \;{H_2}O\; + \;C{O_2} \uparrow$
B

CaCl₂ + Na₂CO₃ → CaCO₃ ↓ + 2NaCl
C

MgSO₄ + Na₂Al₂Si₂O₈xH₂O → Mg Al₂Si₂O₈ xH₂O + Na₂SO₄
D

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

Solution

The temporary hardness of water is due to the presence of bicarbonates of Ca & Mg .
i.e,. Mg[HCo₃]₂
Ca[HCo₂]₃
Temporary hardness of water is removed by boiling, during this process the soluble bicarbonates converting into insoluble carbonates.

$\large Ca{\left( {HC{o_3}} \right)_2}\;\xrightarrow{\Delta }\;CaC{o_3} \downarrow \; + {H_2}O\; + \;C{O_2}$

The insoluble precipiate is removesd by filterration.
Options 3,4 are equations related to removal of permanent hardness of water.

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