Essay on Redox Titration Lab Report - 750 Words

Determination of Fe by Redox Titration Matt Cuff Quant 320L October 21, 2011 Abstract In this experiment the percent of iron in an unknown sample will be determined by using a redox titration and then compared to a different method. A primary standard which in this case is ferrous ammonium sulfate will be used to standardize potassium dichromate. The standardized potassium dichromate will then be used to titrate the unknown iron sample using the indicator p-diphenylamine sulfonate. The standardized potassium dichromate which has a concentration around 0.017 M is then titrated into the unknown iron sample which is dissolved in deionized water. The unknown sample is titrated to its end point using the indicator p-diphenylamine†¦show more content†¦Then use this information to calculate the percent iron in the unknown sample. The only obvious observations that could be made in the experiment was the color change of the solution from green to purple due to the indicator p-diphenylamine sulfonate and also titrating the solution with potassium dichromate. Data Analysis Trial 1 Trial 2 Trial 3 Trial 4 Wt. Fe(NH)2(SO4)2 , g 0.5025 g 0.5010 g 0.5003 g 0.5013 g Vol. K2Cr2O7 , mL 13.72 mL 14.22 mL 13.83 mL 13.69 mL Wt. Unknown , g 0.5020 g 0.5020 g 0.5022 g 0.5004 g Vol. K2Cr2O7 , mL 9.07 mL 10.18 mL 9.53 mL 9.78 mL % Iron in sample 10.29% 11.55% 10.85% 11.11% Trial 1 10.29% Fe Trial 2 11.55% Fe Trial 3 10.85% Fe Trial 4 11.11% Fe Mean 10.95% Fe STD  ± 0.5% Fe RSD  ± 0.05% Fe Calculations [K2Cr2O7] = 0.017 M 9.07 mL K2Cr2O7 * 0.017 M = [pic] Spooled =[pic] Spooled = 9.20 tcalc = [pic] tcalc = 1.197 @ 90% ttable = 1.90 ttable tcalc The two methods are statistically comparable Fcalc = [pic] Fcalc = 676 Ftable = 9.28 Fcalc Ftable The variances of the two methods are statistically different The average percent of iron present in the unknown sample was 10.95% Fe with a standard deviation of  ± 0.5% Fe. 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