First slide

Water and Heavy water

Question

When temporary hard water containing $Mg {({HCO}_{3})}_{2}$ is boiled, the ppt. formed is of

Moderate

A

${MgCO}_{3}$
B

MgO
C

$Mg {(OH)}_{2}$
D

None of these

Solution

$Mg {(OH)}_{2}$ is less soluble than ${MgCO}_{3}$ . On boiling temporary hard water containing ${Mg}^{+ 2}$ ions, the ppt. obtained is of $Mg {(OH)}_{2}$ are not that of ${MgCO}_{3}$ .

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