Copper sulfate: blue transparent crystal, easily soluble in water, slightly soluble in dilute ethanol and insoluble in anhydrous ethanol. Anhydrous copper sulfate is grayish white powder, which easily absorbs water and becomes blue-green copper sulfate pentahydrate. Copper sulfate has no melting point under normal pressure, and decomposes after losing crystal water when heated. It is stable under normal temperature and pressure, does not deliquesce, and will gradually weather in dry air. Copper sulfate is a blue asymmetric triclinic crystal with a specific gravity of 2.29. Chemical properties are stable at room temperature and soluble in water. It can dissolve 16.2% water at 15℃, and the aqueous solution is blue and acidic. If left in the air for a long time, it will gradually lose its crystal water and turn white.

Solute, a substance dissolved by a solvent in a solution. Solute can be solid (such as sugar and salt dissolved in water), liquid (such as alcohol dissolved in water) and gas (such as hydrogen chloride gas dissolved in water). In fact, solute and solvent are just a set of relative concepts in solution. Generally speaking, relatively more substances are called solvents and relatively less substances are called solutes. By default, water is the solvent.