I need to find the price of anhydrous copper sulfate and compare it to the price of pentahydrate of copper sulfate.i just can't get the price of anhydrous copper sulfate in usa
It is simple to make. Just heat the bluestone and it turns white and is CuSO4.
The reasons are practical: Anhydrous copper sulfate is hygroscopic (that is, it will attract water from the air or any other environmental source) and will continue absorbing water until it forms a pentahydrate. The pentahydrate is more stable and less reactive. In addition, the reaction where anhydrous copper sulfate absorbs water is exothermic, meaning that there is a possibility that poorly-stored or sealed containers of anhydrous copper sulfate might cause a fire or another reaction in a neighbouring vessel, if it were to absorb water very quickly. When you consider that the only requirement to turn the pentahydrate crystal into the anhydrous form is heat (and gentle heat, at that -- 200 degrees C, what you might find from a laboratory oven) and the liability issues mentioned above, a chemical supply company would likely come to the same conclusion: Sell the pentahydrate form, avoid the lawsuits, and let the end-user deal with converting it to anhydrous form.
