D.K. The solubility of metal halides depends on their nature, Lattice enthalpy and hydration enthalpy of the individual ions. C a S O 4 , B a S O 4 and M g S O 4 in order of decreasing solubility in water. from Mg 2+ to Ba 2+.Halides are hygroscopic and have the water of crystallization in their solid state (CaCl 2.6H 2 O). Amongst fluorides of alkali metals, the lowest solubility of LiF in water is due to v) Solubility in liquid ammonia Alkali metals dissolves and form solution in liquid ammonia. The alkali metals form monofluorides. Actually I have to tell you it ranges from “not very” to “almost completely insoluble”. . 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: If you study the periodic table, you will know compounds of the top element in a group are often different from the others. 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. Melting point nad boiling point of particular alkali metal follow the order Fluorides > Chlorides > Bromides > Iodides. Amongst fluorides of alkali metals, the lowest solubility of LiF in water is due to: Alkali metal salts are prepared by reacting a metal hydroxide with an acid, followed by evaporation of the water. The Group 1 elements in the periodic table are known as the alkali metals. The solubility of alkali-metal fluorides in non-aqueous solvents with and without crown ethers, as determined by flame emission spectrometry Talanta . 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. When alkali metals All alkali metals react with hydrogen at high temperatures to produce the corresponding hydrides, and all reduce water to produce hydrogen gas. Alkali metal halides are soluble in water due to their high ionic character and low lattice energy. LiF is soluble in non-polar solvents like kerosene. 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. 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) . Q9. 1984 Nov;31(11):1036-40. doi: 10.1016/0039-9140(84)80244-1. Lithium halides LiBr and LiI are covalent compound. The solubility of metal halides depends on their nature, lattice enthalpy and hydration enthalpy of the individual ions. The solubility of other halides decreases with increase in ionic size i.e. Breitinger, in Comprehensive Coordination Chemistry II, 2003. 6.9.4.2.9. . Fluorides are insoluble in water. Fused halides are used as dehydrating agents. (b) high lattice enthalpy. Both Li and Na salts are used as drying agents, compounds that are used to absorb water. ‘ (c) high hydration enthalpy for lithium ion. Among other monofluorides, only silver(I) and thallium(I) fluorides are well-characterized. (i) Mercury fluoride systems. 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