EXPERIMENT 18: Determination of Bleach-A Redox Titration DATA SHEET 1 Part A: St

Question

EXPERIMENT 18: Determination of Bleach-A Redox Titration DATA SHEET 1 Part A: Standardization of 0.1xx M Nas,o 49 z 2 oig Trial 1 Trial 3 Trial 2 0.009 M 0.001 M 0,00 M Concentration of KIO, (from Experiment #17) 10,00AL 10,00m 10.00 Volume of KIO, Pipetted mmol of KIO, (IO, mmol of Li Formed (from Equation 3) For Na,S,O, (S,0,-) 12,68m 16,S Final Burette Reading Initial Burette Reading volume of Na S,0 (aq) Required SibbML Anu mmol of S 0,2 Present (from Equation 2) Molarity Sao Avg. Molarity Nazs,o,

Explanation / Answer

Part A Trial 1 Trial 2 Trial 3

mmol of KIO3 0.098 0.098 0.098 (hint: Molarity=moles/volume in L)

mmol of I3- 0.294 0.294 0.294 (hint: 1 mol of IO3- gives 3 mol of I3-)

mmol of S2O32-   0.588 0.5878 0.588

Molarity of S2O32-   0.1   0.0998 0.0995 (hint: M1V1/M2V2=1/6 where, M1-molarity of KIO3 , V1-volume of KIO3, M2- molarity of Na2S2O3 , V2- volume of Na2S2O3)

Average molarity = (1+0.0998+0.0995)/3 = 0.0998 M

Part B Trial 1 Trial 2 Trial 3

mmol of S2O32- 2.6347 2.8194 2.7145   (hint: Molarity=moles/volume in L)

mmol of I3-   1.3714 1.0947 1.3708 (hint: 2 mol S2O32- require 1 mol I3-)

mmol of OCl- 1.3714 1.0947 1.3708 (hint: 1 mol I3- is produced from 1 mol OCl-)

mass of NaOCl (mg) 98.0672 81.4894 102.0424 (hint: mass=molar mass x moles)

mass of NaOCl (g) 0.0981 0.0814 0.1020   

%(m/m) of NaClO 4.905 4.0098 5.0495 [hint:(mass of NaClO/mass of bleach) x100]

average %(m/m) of NaClO = (4.905+4.0098+5.0495)/3 = 4.6548

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