The equivalent weight of K2Cr2O7 = 49 g/mol
In the solution, K2Cr2O7 gives the following ions,
K2Cr2O7 + 14H+ + 6e– → 2K+ + 2Cr3+ + 7H2O
The chemical equivalent is 6 because six electrons participate in the chemical reaction.
Formula to calculate equivalent weight is
Equivalent weight (Z) = molecular weight / chemical equivalent
Z = M/6