Question 24 of 32 General Chemistry 4th Edition Map University Science Books pre

Question

Question 24 of 32 General Chemistry 4th Edition Map University Science Books presented by Sapling Leaming The amount of l3 (aq) in a solution can be determined by titration with a solution containing a known concentration of S203(aq) (thiosulfate ion). The determination is based on the net ionic equation Given that it requires 42.5 mL of 0.420 M Na2S2O3(aq) to titrate a 20.0-mL sample of l3 (aq), calculate the molarity of l3 (aq) in the solution. Number O Previous ? Give Up & View Solution O Check Answer (0 Next Exit Hint

Explanation / Answer

2S2O3^2- (aq) + I3^-(aq) -----------------> S4O6^2- (aq) + 3I^- (aq)

2 moles            1 moles

Na2S2O3                                                                                     I3^-

M1    = 0.42M                                                                             M2 =

V1     = 42.5ml                                                                           V2    = 20ml

n1    = 2                                                                                     n2   =1

                          M1V1/n1         =         M2V2/n2

                                  M2          = M1V1n2/V2n1

                                               = 0.42*42.5*1/20*2    = 0.446M

concentration of I3^-    = 0.446M

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