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With steam, however, magnesium burns brightly to produce magnesium oxide and hydrogen. Mg(s) + H2O(g) MgO(s) + H2(g) Because the reactivity of the metals increases down the group, the remaining metals react vigorously with cold water. 48 T HE P ERIODIC TABLE (5) Example Ba(s) + 2H2O(l) Ba(OH)2(aq) + H2(g) The metal hydroxide is often produced as a suspension in water. Solubility of group 2 hydroxides and sulphates Solubility data for group 2 hydroxides in water at 298 K are given below. 4 × 10–3 Ba(OH)2 15 × 10–3 As the group is descended, the solubility of the group 2 hydroxides increases.
4 × 10–3 Ba(OH)2 15 × 10–3 As the group is descended, the solubility of the group 2 hydroxides increases. Mg(OH)2 is insoluble, both Ca(OH)2 and Sr(OH)2 are slightly soluble and Ba(OH)2 is fairly soluble. Solubility data for group 2 sulphates in water at 298 K are given below. 0090 × 10–4 As the group is descended, the solubility of the group 2 sulphates decreases. MgSO4 is soluble, CaSO4 is slightly soluble, whereas SrSO4 and BaSO4 are insoluble. 49 T HE P ERIODIC TABLE (6) Thermal stability of nitrates and carbonates Down groups 1 and 2, the thermal stability of the nitrates and carbonates increases.
2) 54 The answers are on page 114. Check yourself 8 Account for the trend in decomposition temperatures of the group 2 carbonates, in terms of the sizes and charges of the cations involved. Carbonate BeCO3 MgCO3 CaCO3 SrCO3 BaCO3 Decomposition temperature/°C 100 1360 540 900 1290 (3) 9 State what would be seen when concentrated sulphuric acid is added to separate samples of the following compounds. (a) Sodium chloride. (1) (b) Sodium bromide. (1) (c) Sodium iodide. (1) (d) What do these observations tell you about the relative ease of oxidation of the hydrogen halides?