The overall objective of this experiment is to determine the mass percent of Nacho, sodium chloride, in standard bleach. The purpose of part 1, is to standardize Sodium Tessellate, Nauseas, with the primary standard Potassium Iodated, KICK. The standardized Nauseas will then be used in Part 2, to help determine the mass percentage of sodium chloride in bleach. The chemical equation used in standardizing sodium tessellate is, 103- (as) + 51- (as) + AH+(as) —> 312 + AH followed by 12 (as) + 2 SASS-2 (as) —> 21- (as) + SASS-2 (as).
This reaction shows hat when KICK and SKI are combined under high acidity, l- is oxidized by 103- and forms 12. Once sodium tessellate is added to the mixture, 12 is reduced to 1-, once again. Once all of the iodide is used up in the reaction, the liquid will changed from brown/yellow to clear. This means that the solution has reached an equivalence point. Since 12 changes the color of the solution, it will be used as an indicator in the titration experiment. In part 2 of the experiment, Nauseas is used to determine the mass percent of Nacho in bleach.
The reaction related to this part is as follows: CIO- as) + 21- (as) + AH+ —> 12 (as) + CLC- (as) + H2O and 12 (as) + ASSES-2 (as) —> 21- (as) + SASS-2 (as). SKI is added to dilute bleach in which the hypochlorite will reduce l- to form 12. Once this solution is created, it will be titrated with the sodium tessellate solution from part 1 to find the mass percent of sodium hypochlorite in the bleach samples. Procedure http://lines. Chem.. UK. Dude/Geochemical/GOSSIPS/Downloading_Labs/Bleach Results Part 1 Trials I CEQ point: Nauseas added 1 | 22. Ml I 2 | 22. Ml I 3 | 23. Mol I part 2 1 29. 10th-ml I 2 | 28. Ml I 3 | 29. 30 ml I Discussion In part 1 of this experiment, the goal is to standardize sodium tessellate which is then used in part 2, to find the mass percent of sodium hypochlorite. The primary standard of this experiment is KICK because, it’s concentration is accurately known. KICK is titrated with Nauseas because, it’s concentration is only approximately known. This process is called Standardization. The number of moles in sodium tessellate is the first calculation that is to be made. (0. 1 mol/L) (. LOLL) = 0. 0002500 mol KICK (0. 002500 mol mol 103 / 1 mol mol 12/ 1 mol mol SASS-2/ 1 mol mol Nauseas / 1 mol SASS-2) . 001 500 mol Nauseas . 001 500 mol Nauseas / . 2270 = . MAMMA (concentration of Nauseas) In part 2 of the experiment, Nauseas is used to determine the mass percent of Nacho in bleach. The reaction related to this part is as follows: CIO- (as) + 21- (as) + AH+ —> 12 (as) + CLC- (as) + H2O and 12 (as) + ASSES-2 (as) —> 21- (as) + SASS-2 (as). SKI is added to dilute bleach in which the hypochlorite will reduce l- to form 12.
Once this solution is created, it will be titrated with the sodium tessellate solution from part 1 to find the mass percent of sodium hypochlorite. Balanced equations are very important in this experiment because, if the equation is balanced, mole ratios twine reactions can be found. If the equations are unequal, the mole ratios will be off which, in turn, will give false calculations. The first calculation of part 2, is to determine the mass of bleach, in grams. Density of the bleach is 1. Egg (given to students). (25. 0 ml dill. Urn/ 100 ml dill . Egg/ 1 2. 710 g Bleach Next, calculate the mol of Nauseas, which can then be used to calculate the mass and moles of Nacho. (0. 06610 L) = . 0019167 mol Nauseas (. 001917 mol mol SASS- / 1 mol mol 12/ 2 mol mol CIO- / 1 mol 12) . 0009585 mol Nacho Molecular Weight = 74. Egg/mol Nacho %corn = . 07135g Niacin/2. Egg Bleach x 100 Percent Composition= 2. 633% Likely sources of error include inaccurate measuring, inaccurate amounts of solutions, simple math mistakes, and inappropriate titrating.
Conclusion The goal of this experiment is to determine the mass percentage of sodium hypochlorite in commercial bleach. It is determined that there is approximately . 0009585 moles of Nacho used in the experiment The percentage of Nacho in bleach is 2. 633%. By standardizing sodium tessellate and using the solution in titration with diluted bleach, an accurate measurement of Nacho can be found.