2.2.2 Solubility of group 2 compounds : Hydroxides and Sulfates

Question 1

Trends in group 2 reactions with water going down group?

Answer 1

Solutions formed become more alkaline

The higher concentration of OH- ions formed, the more alkaline it is.

MORE SOLUBLE IT IS, MORE ALKALINE, HIGHER pH

Question 2

Equation of how hydroxides dissolve in water? Describe it

Answer 2

X(OH)2 (aq) → X2+ (aq) + 2OH- (aq)

Down the group they get more soluble, more of the metal oxide dissolves so more OH- released and so more alkaline with a higher pH

Question 3

Trends in group 2 sulfates as they react with water?

Answer 3

Solubility decreases as you go down group

Question 4

What is the general reaction for group 2 oxides with HCL?

Answer 4

XO (s) + 2HCl (aq) → XCl2 (aq) + H2O (l)