Start studying Reactions of Group 2 Oxides and Hydroxides, and trends in solubility. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Reactions of the hydroxides of group 2 elements with acids 2HCl (a q) + Mg(O H)2 (a q) MgCl2 (a q)+ 2H2O (l) Solubility of hydroxides Group II hydroxides become more soluble down the group. CaO + H 2 O --> Ca(OH) 2 But as the solubility of the hydroxides decreases ascending the group magnesium oxide reacts only slowly with water. (ii) The solubility and the nature of oxides, of Group 2 elements. Group 2 oxides REACT with water. The table below provides information on the variation of solubility of different substances (mostly inorganic compounds) in water with temperature, at one atmosphere pressure.Units of solubility are given in grams per 100 millilitres of water (g/100 ml), unless shown otherwise. Alkali (and not Alkalie!) In water, the small highly charged oxide ions strongly attract water molecules and hydration is followed by hydrolysis. Today we're covering: Properties of Group 2 compounds Reactions Oxides with water Carbonates with acid Thermal decomposition Carbonates Nitrates Solubility Hydroxides Sulfates Let's go! Discuss the trend of the following: (i) Thermal stability of carbonates of Group 2 elements. If the ions are more attracted to each other than the water then the compound will be insoluble. As a result, going down the group, the alkalinity of the solution formed increases when Group 2 oxides react with water Going down the group, the solubility of the hydroxides increases which means that the solutions formed from the reactions of the Group 2 metal oxides and water become more alkaline going down the group Sol: (i) All the alkaline earth metals form carbonates (MC0 3). Name an element from Group 2 which forms an amphoteric oxide and a water soluble sulphate. The ionic oxides of Na 2 O and MgO, are soluble in water, although MgO is only slightly. Reaction with Water. A group 2 oxide would form water instead of hydrogen gas, and as for if it dissolves, I think it depends on is the metal hydroxide is a solid or aqeous as it could form a precipitate. is the water soluble oxides or hydroxides of Group I or II elements.This is a substance. Metal Oxides that are formed from elements in group IA and IIA, except for Be and Mg, react with water to create Hydroxides. Calcium hydroxide is reasonably soluble in water. O 2-(aq) + H 2 O (l) → 2OH-(aq). The group 2 metal is oxidised from an oxidation state of zero to an oxidation state of +2. The majority of compounds formed by group II elements are ionic. M(s) + H 2 O(l) --> M(OH) 2 (aq) + H 2 (g) This is another example of a redox reaction. As a result, BeS0 4 is highly soluble in water. Why are BeSO 4 and MgSO 4 readily soluble in water while CaSO 4, SrSO 4 and BaSO 4 are insoluble? But the answer to your question is no, they are not soluble, they react. Discuss the trend of the following: (i) Thermal stability of carbonates of Group 2 elements. The balance between the attraction of oppositely charged ions to one another and the attraction of separate ions to water dictates the solubility of ionic compounds. (ii) The solubility and the nature of oxides of Group 2 elements. As you can probably see from the periodic table, these elements are Li, Na, K, Rb, Cs, Ca, Sr, Ba. Sodium ions, with only +1 charge and a relatively large radius, hence have a low charge density and hydrolysis does not occur. Group 2 elements all react with water in a similar way: Metal + Water --> Metal Hydroxide + Hydrogen. Contents Group 2 hydroxides are more alkaline down the group and reactivity down the group with water also increases as the first ionisation energy decreases. Q34. All Group II hydroxides when not soluble appear as white precipitates. 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