First slide

Hardness of water

Question

The reagent not used for softening the temporary hardness of water is

Moderate

A

Ca₃(PO₄)₂
B

Ca(OH)₂
C

Na₂CO₃
D

NaOCl

Solution

$Ca {(OH)}_{2} + Ca {({HCO}_{3})}_{2} \overset{}{\to} 2 {CaCO}_{3} + 2 H_{2} O$
${Na}_{2} {CO}_{3} + Ca {({HCO}_{3})}_{2} \overset{}{\to} {CaCO}_{3} + 2 {NaHCO}_{3}$
$NaOCl + H_{2} O \overset{}{\to} NaOH + HOCl$
$NaOH + Ca {({HCO}_{3})}_{2} \overset{}{\to} {CaCO}_{3} + {NaCO}_{3} + H_{2} O$

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