The chemical formula for copper sulfate pentahydrate is CuS4°H2O. Based on your observations, what do you think happens to this formula when the crystals are heated?
In assuming that the answer has something to do with the h2o because when it's heated it becomes dehydrated but I'm not sure what the actual answer is.
I am assuming that you are correct; the water evaporates
You are correct in assuming that the presence of "H2O" in the chemical formula indicates the presence of water molecules in copper sulfate pentahydrate. Heating generally causes the removal of water molecules, a process known as dehydration.
When the crystals of copper sulfate pentahydrate are heated, the water molecules trapped within the crystal lattice are released. Hence, the crystals undergo a chemical change and transform into a different compound, known as anhydrous copper sulfate. "Anhydrous" means without water.
The chemical formula of anhydrous copper sulfate is CuSO4, which indicates that all the water molecules have been removed. So, the original formula CuSO4·5H2O changes to CuSO4 when heated.
To confirm this, you can perform an experiment. Take a sample of copper sulfate pentahydrate crystals and heat them in a controlled environment, such as using a Bunsen burner or a heating plate. Observe the changes in the crystals during heating. Over time, you will notice that the blue crystals lose their color and water vapor may be released. The resulting compound will have a different appearance, indicating the removal of water molecules. You can then analyze the compound with various tests for anhydrous copper sulfate, such as its physical properties or chemical reactions, to determine its identity.