The lattice energy of (s) is 205 kJ/mol and the hydration energies of Na+ and CO3^2- ions are -80 and -40 kJ/mol, respectively. The correct prediction about the solubility of in water is

Question

The lattice energy of $Na_2CO_3$(s) is 205 kJ/mol and the hydration energies of Na+ and CO3^2- ions are -80 and -40 kJ/mol, respectively. The correct prediction about the solubility of $Na_2CO_3$ in water is

Prashant Kotian · Accepted Answer

Correct answer: A. δ H_sol = Lattice + Hydration = 205 + [2*(-80) + (-40)] = 205 - 200 = +5 kJ/mol. Since dissolution is endothermic, increasing temperature shifts equilibrium forward by Le Chatelier's principle, increasing solubility.

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