Grrr

On Monday morning my group has a five hour long biochemistry lab; as we have a test (biochemistry) just an hour prior to this lab, I thought it to be a good idea to prepare for the lab already this Thursday evening. But now I have been preparing for two hours... these instructions are so maddening!! How am I supposed to know what significance ZnSO4 has in the reaction mixture if the information is provided exactly NOWHERE... gahh... wish I had an inborn understanding of chemistry...