Hi guys i'm studying about general chemistry in a physics class. I've some exercices that i'm unable to solve, stuff like this: Copper can be solubilizated in water, oxidating in Cu++ form, reacting with HCrO4- in an acid enviroment realized by H2SO4. Write down the balanced reaction. my problem is to write (not to balance) an reduction/oxidation reaction. The copper is oxidating, so cromium or hydrogen have to reduce. I've thought about 3 different reaction. So, in my proposal, the unbalanced reaction are: Cu + HCrO4- -> Cu++ + Cr2O3 + H2O Cu + HCrO4- -> Cu++ + CrO + H2O Cu + HCrO4- -> CuCrO4 + H2 how to choose the correct one? ciao!