A student then measures 1000 ml of an unknown solution of, Chemistry

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A student then measures 1000 ml of an unknown solution of

Problem- A potassium dichromate is prepared by 0.3525 grams of K2Cr2O7 is enough water to yield 250.0 mL of solution. A student then measures 10.00 mL of an unknown solution of Fe2+ into an Erlenmeyer flask and dilutes with 90 mL of 1.0 M hydrochloric acid. He then titrates this sample with the soultion prepared above. If 38.40 mL of the potassium dichromate solution is needed to reach the end point, what is the concentration of Fe2+ in the original unknown solution?

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