Pre-lab Bleach Analysis Data A. Preparation of Liquid Bleach Volume of original

Question

Pre-lab Bleach Analysis Data A. Preparation of Liquid Bleach Volume of original liquid bleach (ml) 10 B. Titration of Bleach Trial #1 Trial #2 Trial #3 Buret reading, final (ml) 21.10 33.50 45.00 Buret reading, initial (ml) 10.50 22.00 33.75 Volume of Na S Os added (ml) | b | l'I5 |11.1S 010 | .612- I .611 Volume of Na S2O, added (1) Molar concentration of the Na2S,0, (mol/l): 0.100 M Calculations How many moles of sodium thiosulfate did you add for each trial? Trial #1 1. Trial #2 Trial #3 2. What is the average for the moles of sodium thiosulfate added for each trial?

Explanation / Answer

1) number of moles = (molar concentration or concnetration in mols/L) x (volume in L)

molar concentration of Na2S2O3 = 0.1 M or mols/L

Trial- 1 :

Volume = 10.6 ml = (10.6 / 1000 ) L= 0.011 L

number of moles = 0.1 mols/L x  0.011 L = 0.0011 moles

Trial- 2 :

Volume = 11.6 ml = (11.6 / 1000 ) L= 0.012 L

number of moles = 0.1 mols/L x 0.012 L = 0.0012 moles

Trial-3 :

Volume = 11.26 ml = (11.26 / 1000 ) L= 0.0113L

number of moles = 0.1 mols/L x 0.0113L = 0.00113 moles

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