Reactions of Group 2 oxides with water

• All Group 2 oxides are?basic, except for BeO which is?amphoteric?(it can act both as an acid and base)
• Group 2 oxides react water to form?alkaline?solutions which get more?alkaline?going down the group

Group 2 oxide reactions with water table

• Remember that:

oxide + water → hydroxide

And that calcium hydroxide is also called?limewater

Reactions of Group 2 metals with acid

• The Group 2 metals will react with dilute acids to form?colourless solutions of metal salts
  • For example, they will form colourless solutions of metal chlorides if reacted with hydrochloric acid
• When metals react with an acid, the by-product of this reaction is hydrogen gas

Group 2 metal element reactions with dilute acids table

• When some of Group 2 metals react with sulfuric acid rather than hydrochloric, an insoluble sulfate forms
• Going down the group, the Group 2 sulfates become less and less soluble
  • Calcium sulfate is sparingly soluble, but strontium sulfate and barium sulfate are insoluble

Reactions of Group 2 oxides with acid

• Group 2 sulfates also form when a Group 2 oxide is reacted with an acid
• The?insoluble sulfates?form at the?surface?of the oxide, which means that the solid oxide beneath it can’t react with the acid
• This can be prevented to an extent by using the oxide in?powder?form and?stirring, in which case neutralisation can take place
• Remember that:

oxide + dilute hydrochloric acid → salt + water

oxide + dilute sulfuric acid → sulfate + water

Reactions of group 2 hydroxides

• The Group 2 metal hydroxides form?colourless solutions of metal chlorides?when they react with a dilute acid
• The sulfates decrease in?solubility?going down the group (barium sulfate is an insoluble white precipitate)

Group 2 hydroxide reactions with dilute acids table

• Remember that:

hydroxide + dilute acid → salt + water

hydroxide + dilute sulfuric acid → sulfate + water

Reactions of group 2 carbonates

• All Group 2 carbonates (except for?BeCO₃) are?insoluble in water
• All Group 2 carbonates will form?soluble chloride salts,?water and carbon dioxide gas when reacted with dilute hydrochloric acid
• The carbonates of Ca, Sr and Ba form as an?insoluble sulfate layer?on their solid carbonates which?stops?any further reaction after the initial bubbling (effervescence) of carbon dioxide gas?is seen

Group 2 carbonate reactions with dilute acids

• Remember that:

carbonate + dilute hydrochloric acid → salt + water + carbon dioxide

carbonate + dilute sulfuric acid → sulfate + water + carbon dioxide