In this reaction chromium get reduced and tin oxidised. The opposit is not possible.
E = Eox- E red
Use for E the Nernst equation and the concentration of both ions.
The value should be positive.
You mean I have to calculatw E(Cr3+
us8ng the nersy equation??
And do the same thing for Tin?
Because using the standard potential I have: -0.40 + 0.14 = negqtive value
Using the nernst equation will be ok?