Redox) Titration Problem Testing for the concentration of ozone dissolved in wat

Question

Redox) Titration Problem Testing for the concentration of ozone dissolved in water can be accomplished by titrating a known volume of the solution to be tested with a standardized potassium bromide solution. The reaction that takes place forms oxygen gas and the bromate ion, which can be detected spectroscopically. In a particular experiment, a 25.00 mL ozone containing solution was titrated with 37.41 mL of 0.3290 M potassium bromide. Determine the concentration of ozone in the original solution.

Explanation / Answer

O3(g) + 2KBr(aq) + H2O --> Br2(g) + 2KOH(aq) + O2(g)

1 mole of Ozone reacts with 2 moles of KBr

Moles of KBr =Molarity*Volume in L = 37.41*0.329 / 1000 = 0.0123

0.0123 moles of KBr reacts with 1*0.0123/2 = 6.154*10^-3 moles of O3

Moles of O3 = Molarity *Volume in L

6.154*10^-3 = Molarity *25*10^-3

Molarity = 0.246 M of OZONE

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