Finance and Business How do you make ZnSO4 7H2O? How do you make ZnSO4 7H2O? Zinc sulfate crystallises from aqueous solution as a heptahydrate, zinc sulfate-7-water, ZnSO4. 7H2O. You can make zinc sulfate-7-water in the laboratory by reacting zinc carbonate with dilute sulfuric acid. What is the formula for ZnSO4? ZnSO₄ What is the Colour of ZnSO4 7H2O? 5H2O is blue but ZnSO4 . 7H2O is colourless. Related Posts:Is H2SO3 acidic or neutral in the water?What is MgSO4 7H2O used for?What is iron II sulfate heptahydrate?What is the other name of fuming sulphuric acid?