Na+NO3
Ca2+(PO4)3 The solubility of NaNO3 in water is 92.1g/100 mL at 25°C, while that of Ca3(PO4)2 in water is 0.002 g/100 mL. Explain this difference in solubility. There are higher lattice energies in Ca3(PO4)2 compared to NaNO3, which makes it less soluble in water.