Provide a table that lists the concentration of iron (II) in units of milligrams of iron per litre, and the measured absorbances, for the solutions in test tube 2-5. Provide sample calculations for test tube 2. Test tube 2: 0.260 A, test tube 3: 0.555 A, test tube 4: 0.361 A , test tube 5: 1.048 A .Plot Absorbance versus iron(II) concentration for your four standard concentrations. Add a line of the best fit and provide the equation for the line and the R2 value. Your slope should have at least three significant figures, and your intercept should have at least three decimal places. Use your line of best fit to determine the concentration of iron(II) in the solution in test tube 6 (the vitamin solution), in units of milligrams per liter. Determine the concentration of iron(II) in the 100 mL solution you prepared. Volume of standard iron(II) solution is 100 mL. The concentration of standard iron(II) solution=20.1/0.100=201 mg/L.
test tube | 1% hydroxylamine l 1 M sodium | 0.1% 1,10- l distilled prepared solution hydrochloride acetate phenanthroline water 1.0 mL 1.0 mL 1.0 mL 1.0 mL 1.0 mL (blank)1.0 mL 1.0 mL 1.0 mL 6.0 mL iron(II) standard: 1.0 mL 1.0 mL 7.0 mL None 1.0 mL 1.0 mL 1.0 mL 1.0 mL 1.0 mL Iron(II) standard: 2.0 mL 5.0 mL 4.0 mL iron(II) standard: 3.0 mL iron(II) standard: 4.0 mL vitamin solution: 5.0 mL 1.0 mL 30 ml iron(Il) standards 11.0 mL 2.0 mL| 1.0mã 10mL
