Question

A sample of crystalline compound when heated in an open test tube, produced several droplets of water on the upper part of the test tube. When the residue is dissolved in water, a yellow brown solution is formed. In contrast to The colorless solution formed when a sample of the original compound is dissolved in water. what evidence would lead you to conclude that the compound is not truly hydrate

Answer 1

To be considered a true hydrate, a compound must follow a few rules, and one of these rules is the color being the same before and after heating. In this case we have a difference in the color, the residue after heating when dissolved in water is forming a yellow brown solution, and in the meanwhile, a colorless solution is formed when a sample of the original compound is dissolved in water, which is not a characteristic of a true hydrate.