Chemistry Forum

How do I solve this redox reaction, when one of the reactants is missing (that is how my academic teacher assigned it) ? BiO3 {-} + Cr{3+} + (blank) = Cr2O7{2-} + Bi {3+} + H2O When I tried to solve it, it requiers 28 OH {-} in the blank space, but I think I did something wrong there. That seems jus...