Question

Suppose a student diluted and titrated a bleach unknown exactly as described in the experimental procedure, except only a single titration was performed which required 15.04 mL of 0.100 M Na S 02. The density of the original, undiluted bleach unknown was 1.028 g/mL 1. Calculate the number of moles of Na2S2O3 used in the titration 0.00150 mol 2. Calculate the number of moles of CIO in the sample titrated. Hint: 0.003 *mol Your answer is incorrect - Check your calculations. 3. Calculate the grams of NaClO in the titrated bleach sample, assuming all of the hypochlorite ion comes from sodium hypochlorite. Hint: 0.140 g Your answer is incorrect - Check your calculations. 4. Calculate the mass in grams of UNDILUTED bleach that was in the sample of bleach titrated. Hint: 15.46112 g Your answer is incorrect - Check your calculations. 5. Using the UNROUNDED answers to questions 3 and 4, calculate the weight percent of NaClO in the undiluted bleach sample. Hint. 0.95 # %w/w Your answer is incorrect - Check your calculations.

ive tried getting help for these problems numerous times and havent had any luck.

Answer 1

Just see here chlorine water cannot be titrated against the standard thiosulfate solution. The standard procedure es to react the acie unter with an excess of acidified KI which concerts all of the cene to Iz which can be detected 2 ceoe +2IO + 2H0 Iz t att tho So are can say one mole of cloo com produce the one mole of Is. I Now Todine is tritated with thiosulfate. Iz +25202- 2 0 + soog?- So by this we com say Imole of hypochlorite is eduivalent to 2 mole of thiosulfate. 0 Mole of Na₂S₂O3 Present in 15.04 ml of 0.100m st. solution = ang al molar in 1000 ml = 15g. nghmol o.1 molarin 1000me= 158.11 0.1 molarin Ime= 158.11 10x 1000 0.1 molar in 15.04 me = 158.11 15.04 000 ? 0.237797449 So in 0.1M ,15.04 mL of solution contain=0-23779744 g of Nq5283 So moles of Na28203 0.237797449) mass 158.) (belo) molecular mass = 0.001504 AM @ I mole of NQzS2O3 titrate ons mole of hy bochlorite so mole of cloo is edual to = mole of Na2S2O3 -0.001504 = 0.000752 Are grams of Naclo = mole of Nacio x moleer lar mass of Nacio. = 0.000752 X 74.214 g/mol = 0.0559788 gram mole) Thank for giving opportunity to me for solving this kind of question, first read the theory is and then try out solving other question. Theory is the best thing to solve out any problems. –Vikash Singh he (V.S-K)