Sure! I can answer that for you.  

The hydroxides of sodium, potassium, and ammonium are very soluble in water. The hydroxides of calcium and barium are moderately soluble. The oxides and hydroxides of all other metals are insoluble.  This is because the M-O bonds are typically strong, so non-Group-I metal oxides tend to be insoluble in solvents, though they may be attacked by aqueous acids and bases.

Is there anything I can do to assist you further with chemistry, or anything else?
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