Question

arrange in increasing solubility in water : Mg(OH)2 , Sr(OH)2, Ba(OH)2,​ Ca(OH)2

Answer 1

I'll just type the elements ok?Maybe u can understand it
Ba,Sr,Ca,Mg.
Because the bond becomes weaker down the group.
Hope it is helpful.

REGARDS,
Adithiya

Answer 2

These compounds in the increasing solubility of water can be expressed as $Mg(OH)_2 < Ca(OH)_2 < Sr(OH)_2 < Ba(OH)_2.$.

Explanation:

• The metal hydroxides present in the $2^n^d$ group become more and more soluble as we go down in the group.

• This is primarily due to the decreasing lattice energy which is noticeable while going down in the group.

• Higher the hydration energy ​higher will be the solubility.

• If lattice energy is high in a compound then more amount of energy will be required to break it into the hydroxide and metal ions.

• By the order given above, we can make some statements like Magnesium appears to be very insoluble in water.

• Barium hydroxide is very soluble to produce a solution containing a concentration of 0.1 $mol dm^-^3.$.

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