1) A student prepares a potassium dichromate solution by dissolving .5263 gram o

Question

1) A student prepares a potassium dichromate solution by dissolving .5263 gram of dry solid potassium dichromate in enough water to make 1000.mL of solution. What is the concentration of dichromate ions in the resulting solution?

2)A student 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. She then titrates this sample with the solution prepared in question#1 .If 29.50 mL of the potassium dichromate solution is needed to reach the endpoint, what is the concentration of Fe2+ in the original unknown solution.

Explanation / Answer

Molarity = moles of solute/liters of solution

1) 0.00179 M is concentration of Potassium dichromate

V1 = 29.5 mL M1 = 0.00179 mL V2 = 10 mL M2 = (V1xM1) / V2

2) Answer = 0.00528 M Of Fe+ is present in unknown solution

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