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An unknown Fe(II) sample is added to 2.50 mL of a 0.0300 M potassium dichromate solution...

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Chemistry

An unknown Fe(II) sample is added to 2.50 mL of a 0.0300 Mpotassium dichromate solution (in acidic medium) in a 25 mLvolumetric flask. 2 M H2SO4 is added to fill the flask to thecalibration mark. After the reaction proceeds to completion, theabsorbance of the solution at 447 nm is measured to be 0.550 usinga 1.00-cm path length. Calculate the following and enter youranswers with correct significant figures. Extinction coefficient ofCr2O72-in 2M sulfuric acid at 447 nm is 350. M-1cm-1

Molarity of Cr2O7 2- in the solution after reaction.

Moles of Cr2O7 2− that reacted.

Moles of Fe(II) that reacted.

Answer & Explanation Solved by verified expert
3.6 Ratings (637 Votes)
Fe2 reacts with Cr2O72 in acidic medium according to thefollowing equationSo 1 mol of Cr2O72 reacts with 6moles of Fe2According to the LambertBeer law we knowhere A absorbance of the solution molar    See Answer
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