Hydrate Composition & Formula

• A compound is composed of two or more different elements, that are chemically combined.
      Ex. H20
• A mixture is made up of two or more different substances that are not chemically combined.
      Ex. Salt Water

A hydrate is a compound because when the hydrate was heated, it produced a chemical change. The evidence that proves it was a chemical change is how the color went from a blue to almost a white color. The calculations of the percentage of water was the mass of the hydrate that was determined before an after it was heated. The difference was the amount of water that was added.

Calculations:
50.95-50.01=0.94
Mass of hydrate= 1-0.55= .45
(0.45/1)= 0.45×100= 45%

In compounds, the ratios are constant. But in a mixture they are different. I believe that the amount of water in a hydrate provides evidence that can be proved through similar percentages. But in our case, many of my classmates had completely different percentages. That being said it was hard to gather more evidence that a hydrate is a compound other than the fact that it changed color.