Ferris & Mona used the ORP sensor to titrate a ferrous ammonium sulfate solution, (NH4)2Fe(SO4)2 with KMnO4 titrant. They titrated a 12.50 mL aliquot of the Fe+2 solution with 0.0215 M MnO4- solution and determined that the equivalence point was at 10.8 mL. What is the molarity of the Fe+2 solution?

Molarity of solution is 0.0928 M.

Explanation:

Balanced equation:

Number of moles of in 10.8 mL of 0.0215 M solution

= = 0.000232 moles

Let's assume molarity of   solution is S(M)

Number of moles of in 12.50 mL of S(M) solution

= = 0.0125S moles

According to balanced equation, 5 moles of   react with 1 mol of

So, 0.0125S moles of react with moles of

Hence,

         or, S = 0.0928

So, molarity of solution is 0.0928 M.

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