B.1 Reaction of a Hydrate Addition of Water (2) Appearance Heating (1) Initial Final Why did water droplets form at the mouth of the test tube when heated? lue color ted ought to hae n the r outh artho at tempt tube . 05 When the hydrate of Cuso, 5H0) was heated, did the reaction proceed in the direction of the reactants or products? produc Copyright © 2014 Pearson Education, Inc. Solution CuSO4.5H2O 5. when heated CuSO4.5H2O, the reaction proceeds to the right handside, that is towards the product end. It looses it water of crystallization to form anhydrous CuSO4 salt. Color changed to white. 6. When water was added, the reaction proceeded to the left handside, such that towards the reactant end. The color changed to blue due to the formation of CuSO4.5H2O..