Question

Why bao is soluble in whereas baso4 is insoluble in water?

Answer 1

Hence, it is not soluble in water. Due to small size of BaO it is easily hydrated by water molecules , like Li is best hydrated due it's smallest size in its group the same stands for BaO but you should also check for the enthalpy of formation of both BaO and BaSO4 and compare with heat of hydration of both .

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