(Original post by EierVonSatan)
They're asking about anions (negatively charged ions).
Group 2 hydroxides solubility increases down the group - which solution would this be?
Group 2 sulfates solubility decreases down the group - which solution would this be?
Group 2 carbonates are sparingly soluble at the top of the group and get less soluble - which solution would this be?
Okay, so I tried to work it out again.
Solution 1 - Carbonate, as Group 2 carbonates have very similar, though decreasing, solubilities going down the group so all the precipitates look the same
Solution 2 - Hydroxide, as Group 2 hydroxides increase in solubility going down the group so the precipitate gets lighter from Mg(OH)2 to Ba(OH)2
Solution 3 - Sulphate, as Group 2 sulphates decrease in solubility going down the group so the precipitates get heavier
Is that right? Thank you v much for the help BTW.