In order to determine the concentration of a commercial

Question

sample of hydrogen peroxide (H2O2
), 15 mL of it was
diluted to 300 mL. Then 20 mL of diluted solution was
acidified and titrated with a 0.021 M potassium
permanganate solution (KMnO4
). An average volume of
18.72 mL was required. Determine the concentration of
the original hydrogen peroxide

Answer 1

To determine the concentration of the original hydrogen peroxide solution, we can use the following equation:

M1V1 = M2V2

Where:
M1 = concentration of original hydrogen peroxide solution
V1 = volume of original hydrogen peroxide solution (15 mL)
M2 = concentration of potassium permanganate solution (0.021 M)
V2 = volume of potassium permanganate solution required for titration (18.72 mL)

Plug in the values and solve for M1:

M1(15 mL) = (0.021 M)(18.72 mL)
M1(15) = 0.39312
M1 = 0.39312 / 15
M1 = 0.026208 M

Therefore, the concentration of the original hydrogen peroxide solution is 0.026208 M.