Question

The titration of 25.0 mL of an iron(II) solution required 18.0 mL of a 0.265 M solution of dichromate to reach the equivalence point. What is the molarity of the iron(II) solution?

Answer 1

6Fe^2+ + Cr2O7^2- ==> 2Cr^3+ + 6Fe^3+
mols Cr2O7^2- = M x L = ?
mols Fe^2+ = 6 x that.
M Fe^2+ = mols Fe^2+/L Fe^2+
(Note: I didn't balanced the equation completely; actually we need only the redox part balanced.

Answer 2

(18ml)(.265M)/1 mole=(25ml)(xM)/6mole

xM=1.14M