Fused halides are used as dehydrating agents. Fluorides are insoluble in water. 1984 Nov;31(11):1036-40. doi: 10.1016/0039-9140(84)80244-1. This question illustrates it well. They include lithium, sodium and potassium, which all react vigorously with water to produce an alkaline solution. 6.9.4.2.9. (b) high lattice enthalpy. ‘ (c) high hydration enthalpy for lithium ion. The alkali metals form monofluorides. The Group 1 elements in the periodic table are known as the alkali metals. When alkali metals Both Li and Na salts are used as drying agents, compounds that are used to absorb water. LiF is soluble in non-polar solvents like kerosene. Lithium halides LiBr and LiI are covalent compound. The solubility of alkali-metal fluorides in non-aqueous solvents with and without crown ethers, as determined by flame emission spectrometry Talanta . . Amongst fluorides of alkali metals, the lowest solubility of LiF in water is due to (a) ionic nature of lithium fluoride. The solubility of other halides decreases with increase in ionic size i.e. The solubility of metal halides depends on their nature, Lattice enthalpy and hydration enthalpy of the individual ions. Actually I have to tell you it ranges from “not very” to “almost completely insoluble”. Alkali metal salts are prepared by reacting a metal hydroxide with an acid, followed by evaporation of the water. 2) The solubility of most of the alkali metal halides except those of fluoride decreases on descending the group since the decrease in hydration enthalpy is more than the corresponding decrease in the lattice enthalpy. The solubility of metal halides depends on their nature, lattice enthalpy and hydration enthalpy of the individual ions. Amongst fluorides of alkali metals, the lowest solubility of LiF in water is due to: D.K. Q9. . Melting point nad boiling point of particular alkali metal follow the order Fluorides > Chlorides > Bromides > Iodides. Alkali metal halides are soluble in water due to their high ionic character and low lattice energy. All alkali metals react with hydrogen at high temperatures to produce the corresponding hydrides, and all reduce water to produce hydrogen gas. C a S O 4 , B a S O 4 and M g S O 4 in order of decreasing solubility in water. All are soluble and have the sodium chloride (rock salt) structure, Because the fluoride anion is basic, many alkali metal fluorides form bifluorides with the formula MHF 2. Amongst fluorides of alkali metals, the lowest solubility of LiF in water is due to Salts of Oxoacids Since the alkali metals are highly electropositive, therefore their hydroxides are very strong bases and hence they form salts with all oxoacids ( H 2 CO 3 , H 3 PO 4 , H 2 SO 4 , HNO 3 , HNO 2 etc) . The solubility of metal halides depends on their nature, lattice enthalpy and hydration enthalpy of the individual ions. v) Solubility in liquid ammonia Alkali metals dissolves and form solution in liquid ammonia. Among other monofluorides, only silver(I) and thallium(I) fluorides are well-characterized. If you study the periodic table, you will know compounds of the top element in a group are often different from the others. For Ex: LiF is almost insoluble in water due to its high lattice energy.The low solubility of CsI is due to smaller hydration energy of the two ions. (i) Mercury fluoride systems. from Mg 2+ to Ba 2+.Halides are hygroscopic and have the water of crystallization in their solid state (CaCl 2.6H 2 O). View solution A metal M readily forms water-soluble sulphate M S O 4 ,water-insoluble hydroxide M ( O H ) 2 and oxide MO which becomes inert on heating.The hydroxide is soluble in NaOH,The M is: Breitinger, in Comprehensive Coordination Chemistry II, 2003. 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