Melting Points Because of the many simultaneous attractions between cations and anions that occur, ionic crystal lattices are very strong. The process of melting an ionic compound requires the addition of large amounts of energy in order to break all of the ionic bonds in the crystal.

Charcot-Leyden crystals (CLCs), having both hexagonal and bipyramidal forms, were first reported in 1853 by Jean-Martin Charcot who found tiny crystals in the cardiac blood and spleen of a patient who died from leukemia [ 1 ]. In 1872, Ernst Viktor von Leyden also described colorless crystals found in the sputum of asthma patients [ 2 ].

Take a 250 ml beaker and wash it with water. Transfer 7.0 g ferrous sulphate and 3.5 g ammonium sulphate crystals to it. In another beaker boil about 20 ml of water for about 5 minutes to expel dissolved air. Add the boiling hot water to the contents in the first beaker in small instalments at a.