Suppose you have a mixture of solid mg (oh) 2 and baso4, how do you separate the mixture

This separation technique is a 4-step procedure. First, add H₂SO₄ to the solution. Because of common ion effect, BaSO₄ will not react, only Mg (OH) ₂.

Mg (OH) ₂ + H₂SO₄ → MgSO₄ + 2 H₂O

The aqueous solution will now contain MgSO₄ and BaSO₄. Unlike BaSO₄, MgSO₄ is soluble in water. So, you filter out the solution. You can set aside the BaSO₄ on the filter paper. To retrieve Mg (OH) ₂, add NaOH.

MgSO₄ + 2 NaOH = Mg (OH) ₂ + Na₂SO₄

Na₂SO₄ is soluble in water, while Mg (OH) ₂ is not. Filter this solution again. The Mg (OH) ₂ is retrieved in solid form on the filter paper.