The amount of I_3^- (aq) in a solution can be determined by titration with a solution containing a known concentration of S_2O_3^2- (aq) (thiosulfate ion). The determination is based on the net ionic equation 2S_2 O^2-_3 (aq) + I^-_3 (aq) rightarrow S_4 O^2-_6 (aq) + 3I^- (aq) Given that it requires 35.8 mL of 0.360 M Na_2S_2O_3 (aq) to titrate a 30.0-mL sample of I_3^- (aq), calculate the molarity of I_3^- (aq) in the solution. M