salt, NaCl, has a solubility of 35-7g per 100g of water at 0 degree celsius. The solubility of salt in water does not vary appreciably with temperature. NaCl is an electrolyte that commonly used to melt ice by lowering its melting point. what is the lowest possible melting point for ice that could be obtained considering the solubility of NaCl in water? The Kf for H2O is 1-86 degree C/m.