Both calcium sulfate and magnesium sulfate can form hydrates with water. Could white anhydrous CaSO4 or MgSO4 be substituted for anhydrous CuSo4? Why or Why not?

It depends upon what you are doing, doesn't it? You need to provide some information about your question/experiment.

If it has to do with the determination of moisture, No, it can not, its used as an indicator to see if hydration is taking place, (or that the chemical is absorbing the moisture) If it turns blue, its indicating that water is present in the substance that you are testing,

(Anhydrous cupric sulphate is used to dry liquids, so if you are testing to see if moisture is present/not present, it cannot be substituted) Hope that helps.

Also MgSO4 is slight acidic and CaSO4 doesn't absorb water as well. So CuSO4 is easier to work with.

To determine whether white anhydrous calcium sulfate (CaSO4) or magnesium sulfate (MgSO4) can be substituted for anhydrous copper sulfate (CuSO4), we need to consider the chemical properties and characteristics of these compounds.

Anhydrous compounds do not contain any water molecules in their structure. In contrast, hydrates have water molecules incorporated into their crystal lattice structure. When a hydrate loses these water molecules, it becomes an anhydrous compound.

While both calcium sulfate and magnesium sulfate can form hydrates with water, it is important to note that each compound has different chemical and physical properties. Copper sulfate, specifically anhydrous CuSO4, has distinct properties that make it suitable for certain applications.

One of the key considerations is the color of these compounds. Anhydrous copper sulfate (CuSO4) is a blue crystalline solid, whereas both anhydrous calcium sulfate (CaSO4) and magnesium sulfate (MgSO4) are white.

If the color is an important characteristic for the desired application, then white anhydrous CaSO4 or MgSO4 may not be suitable substitutes for the blue anhydrous CuSO4.

However, chemical reactivity is another critical factor. Copper sulfate is commonly used as a catalyst or reagent in various chemical reactions. It possesses specific properties that enable it to participate in reactions effectively. Substituting the anhydrous forms of calcium sulfate or magnesium sulfate may not yield the desired results, as their chemical reactivity and catalytic abilities could be different.

To conclude, while anhydrous calcium sulfate and magnesium sulfate do not possess the same color as anhydrous copper sulfate, the major consideration should be the specific chemical properties and reactivity required for the intended use.