Solution:Copper sulphate crystals, salt, and sugar are soluble in water.
Solubility is defined as the greatest amount of solute that may dissolve in a certain quantity of solvent at a given temperature. Salt, sugar, and coffee all dissolve in water. They are dissolvable. Warm or hot water typically dissolves them faster and better. Pepper and sand are insoluble; even hot water will not dissolve them. Sawdust and wheat flour are insoluble, but copper sulphate crystals, salt, and sugar are soluble.