First slide

Hardness of water

Question

Solubility of a salt depends on lattice enthalpy and hydration enthalpy. Least soluble salt in water among the following is

Moderate

A

$Mg {({HCO}_{3})}_{2}$
B

${CaCl}_{2}$
C

${MgSO}_{4}$
D

${CaCO}_{3}$

Solution

${HCO}_{3,}^{-} {Cl}^{-}, {SO}_{4}^{- 2} of {Ca}^{+ 2} and {Mg}^{+ 2}$ are soluble in water and are responsible for hardness of water;
${CaCO}_{3}$ is insoluble in water.

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