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If you study the periodic table, you will know compounds of the top element in a group are often different from the others. Those of the alkali metals and ammonium ion are soluble. 6. Most of the precipitation reactions that we will deal with involve aqueous salt solutions. Each rule has exceptions and the important ones are noted. Colours of metal sulfides are important in identifying compounds in inorganic chemistry. All alkali metals sulfide and alkaline earth metals sulfides are soluble in water and form colourless aqueous solutions. 1. most sulfates are soluble except BaSO4, Hg2SO4,PbSO4 and CaSO4 sulfate. Hydroxides of the lighter alkaline earth metals are insoluble in water, but their solubility increases as the atomic number of the metal increases. Those of the alkali metals and ammonium ion are soluble. 2. The lattice energy remains constant because sulphate ion is so large, so that small change in cationic sizes do not make any difference. The alkaline earth metals are soluble. Actually I have to tell you it ranges from “not very” to “almost completely insoluble”. Sulfides are generally insoluble. Cr 2 S 3 and Al 2 S 3 decompose and precipitate as hydroxides. Because BeO and MgO are much more inert than the other group 2 oxides, they are used as refractory materials in applications involving high temperatures and mechanical stress. There are solubility rules to follow when prdicting the solubility of a salt.see below. Solubility of sulphates and carbonates of alkaline earth metals decreases as the atomic number of the metal increases down the group because the size of the cation increases down the group. S block metal sulfides - Alkali metals and alkaline earth metals. These rules are general and qualitative in nature. This question illustrates it well. Hydroxides of the lighter alkaline earth metals are insoluble in water, but their solubility increases as the atomic number of the metal increases. Get an answer for 'Describe the relationship between the solubility of the salts containing alkaline earth metal ions and the position of the metals in the periodic table.' so your answer becomes BaSO4

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