Solubility of Group 2 Compounds: Hydroxides & Sulfates Flashcards
Group 2 hydroxides
Going down the group, the solutions formed from the reaction of group 2 oxides with water become more
alkaline
When the oxides are dissolved in water, the following ionic reaction takes place:
O2- (aq) + H2O (l) → 2OH- (aq)
The higher the concentration of OH- ions formed, the more
alkaline the solution
The alkalinity of the solution formed can therefore be explained by the solubility of the Group 2 hydroxides
The hydroxides dissolve in water as follows:
X(OH)2 (aq) → X2+ (aq) + 2OH- (aq)
Where X is the Group 2 element
When the metal oxides react with water, a group 2 ……. id formed
group 2 Hydroxide
Going down the group, the solubility of these hydroxides
This means that the concentration of OH- ions…….
increases
This means that the concentration of OH- ions increases, increasing the pH of the solution
As a result, going down the group, the alkalinity of the solution formed increases when Group 2 oxides react with water
solubility meaning
is the maximum concentration of solute (a substance that dissolves in a solvent) that can be dissolved in the solvent (dissolver).
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