e amount of Is (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 25,0| (aq) +13 (aq) â S,0. (aq) +31 (aq) Given that it requires 42.0 mL of 0.270 M Na2S203(aq) to titrate a 30.0-mL sample of 13 (aq), calculate the molarity of l3 (aq) in the solution. Number