The hydroxides get more soluble as you go down the group. They are all white solids.
Magnesium is alomost insoluble, being sold in a suspension in water rather than as a solution.
Calcium Hydroxide is sparyingly soluble.
Strontium Hydroxide is more soluble.
Barium Hydroxide dissolves and forms a strong alkaline solution as seen below
Ba(OH)2(s) + aq --> Ba2+(aq) + 2OH-(aq)
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