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April 25, 2015

Homework Help: Chemistry

Posted by Bryant on Sunday, March 6, 2011 at 9:06pm.

Can someone please help me complete these calculations for my lab; I am having some trouble.

A. Standardization of Na2S2O3
-Mass of KIO3 in 100mL = 0.09600g
-Calculate Molarity of KIO3= ?
Please check: 0.09600g/(214.0g/mol)=4.486x 10^-4 mol
-4.486 mol/0.1L= 44.86 M

B. Titration/ Volume of Na2S2O3
1: 38.44 mL
2: 37.23 mL
3: 38.11 mL
Average Volume: 37.93mL

-Calculate molarity of Na2S2O3=?
Not sure what to use as the mass here? Help

C. V of Bleach= 1.020
V of Na2S2O3= 2.010
Calculate Mass of NaOCl/100mL bleach=? Help with this.

Thanks.

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