The melting and boiling points of NaCI compound are 815°C and 1413°C respectively which is relatively high. NaCl or ionic compounds are soluble in water.
Ionic compounds are generally soluble in polar solvents and insoluble in non-polar solvents. Polar compounds are such compounds, at whose one end there is a partial positive charge and at another end there is a partial negative charge. Water is such a compound. Liquid NH3, HNO3, liquid SO2, liquid HX (X = F, Cl, Br.) are examples of polar solvents. On the other hand CCI4, C6 H6, kerosene, diesel etc are examples of non-polar solvents.
The process of dissolution of ionic compounds in a polar solvent like water. The molecule of a polar compound has two poles at two ends. During dissolution the positive pole of the solvent is oriented towards the negative ion of the ionic crystal and the negative pole to the positive ion. Hence the ions are attracted towards the solvent and gradually comes to the solvent medium from the crystal In solution the ions are not free, but remains solvated, in other words, surrounded by solvent molecules This process is called solution. When the solvent is water, the process is called in hydration.