CHEM 1010H Lecture Notes - Lecture 2: Sodium Thiosulfate, Thiosulfate, Burette

• School: Trent University
• Department: Chemistry
• Course: CHEM 1010H
• Professor: Anthony Chibba

Document Summary

Chem1010h report 2 (chemical analysis of bleach) Part a standardization of sodium thiosulphate (na2s2o3) Kio3 (aq) + 6na2s2o3(aq) + 3h2so4(aq) i-(aq) + k+(aq) + 3s4o6. Calculate the concentration of the sodium thiosulphate solution. Mol of kio3 = 0. 01mol/l x 0. 0200l = 0. 0002mol. Mol of na2s2o = 0. 0002mol kio3 x (6 mol na2s2o3,/ 1 mol kio3) [na2s2o3]= mol of na2s2o3 / volume of na2s2o3. Calculate the average concentration of the thiosulphate, as well as the standard deviation of the concentration of the sodium thiosulphate solution. Average concentration = (cid:2868). (cid:2868)(cid:2873)(cid:2868)(cid:2870)(cid:2869) (cid:3040)(cid:3039)/ + (cid:2868). (cid:2868)(cid:2874)(cid:2871)(cid:2869)(cid:2870) (cid:3040)(cid:3039)/ + (cid:2868). (cid:2868)(cid:2873)(cid:2877)(cid:2875) (cid:3040)(cid:3039)/ = (cid:4666)(cid:882). (cid:882)5(cid:882)(cid:884)(cid:883) (cid:1865)(cid:1867)(cid:1864)/ (cid:2868). (cid:2868)(cid:2873)(cid:2875)(cid:2874)(cid:2875) (cid:3040)(cid:3039)/(cid:4667) 2+ (cid:4666) (cid:2868). (cid:2868)(cid:2874)(cid:2871)(cid:2869)(cid:2870) (cid:3040)(cid:3039)/ (cid:2868). (cid:2868)(cid:2873)(cid:2875)(cid:2874)(cid:2875) (cid:3040)(cid:3039)/(cid:4667)2+(cid:4666) (cid:2868). (cid:2868)(cid:2873)(cid:2877)(cid:2875) (cid:3040)(cid:3039)/ (cid:2868). (cid:2868)(cid:2873)(cid:2875)(cid:2874)(cid:2875) (cid:3040)(cid:3039)/(cid:4667)2 (cid:2871) (cid:884) Part b determination of hypochlorite concentration in bleach. Provide the complete and balanced equation for this reaction. Nacio + 2na2s2o3+ h2so4 h2o + cl- + s4o6.