The lattice enthalpy and hydration enthalpy of four compounds are given below. [table] Compound | Lattice enthalpy (in kJ $mol^{- 1}$) | Hydration enthalpy (in kJ $mol^{- 1}$) ; P Q R S | +780 +1012 +828 +632 | -920 -812 -878 -600 [/table] The pair of compounds which is soluble in water is

Question

Dr. Abubacker · Accepted Answer

(d)
The solubility of a compound mainly depend upon its hydration energy. If the hydration energy of a compound is greater than from its lattice enthalpy, then its is soluble in water. Thus, for solubility
Hydration enthalpy $>$ lattice enthalpy
For compounds P and R hydration enthalpy exceeds the lattice enthalpy, so they are soluble in water.

Q. The lattice enthalpy and hydration enthalpy of four compounds are given below. [table] Compound | Lattice enthalpy (in kJ $mol^{- 1}$) | Hydration enthalpy (in kJ $mol^{- 1}$) ; P Q R S | +780 +1012 +828 +632 | -920 -812 -878 -600 [/table] The pair of compounds which is soluble in water is

Explanation

Reviewed by Dr. Abubacker

Want more practice?