o 4/29/2016 06:00 PM @ 4.1/1004/28/2016 1 1:03 PM Gra Print Calculator-[Periodic

Question

o 4/29/2016 06:00 PM @ 4.1/1004/28/2016 1 1:03 PM Gra Print Calculator-[Periodic Table Question 21 of 23 University Science Books presented by Sapling Learming Map Donald McQuarrie Peter A. Rock Ethan Gallogly The amount of l3 (aq) in a solution can be determined by titration with a solution containing a known concentration of S20s -(aq) (thiosulfate ion). The determination is based on the net ionic equation 2s,of(aq) + 1, (aq) s,o:(aq) + 31-(aq) Given that it requires 32.5 mL of o.300 M NazS-Os(aq) to titrate a 20.0-mL sample of 's (aq), calculate the molarity of ls (aq) in the solution. Number

Explanation / Answer

V1 = 32.5 mL, N1 = 0.3 M for Na2S2O3

V2 = 20 mL , N2 = ? for I3-

so N2 = 32.5 * 0.3 / 20 = 0.4875 M of I3- needed if the reaction is 1:1 of Na2S2O3 : I3- ,

but actual ratio is 2:1 so 0.4875 / 2 = 0.244 M of 20 mL  I3- needed

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