What is the molarity of a potassium triiodide solution, ki3(aq), if 30.00 ml of the solution is required to completely react with 25.00 ml of a 0.300 m thiosulfate solution, k2s2o3(aq)? the chemical equation for the reaction is 2 s2o32-(aq) + i3-(aq) → s4o62-(aq) + 3 i-(aq).

Molarity of triiodide solution is 0.125M

Explanation:

According to balanced equation, 2 moles of completely react with 1 mol of .

Moles of in 25.00 mL of 0.300 M of solution =

So, 0.0075 moles of completely reacts with of or 0.00375 moles of

If molarity of solution is S (M) then-

or,

So, molarity of triiodide solution is 0.125M