how to prepare znso4 solution?
['Take about 100 ml of purified water in a cleaned and dried 1000 ml volumetric flask.', 'Add about 28.8 gm of zinc sulfate with continues stirring.', 'Add more about 700 ml of purified water, mix and allow to cool to room temperature.', 'Make up the volume 1000 ml with purified water.']