Question

Dr. Waters found an old bottle of dilute hydrogen peroxide in her refrigerator and needs your help in determining the percent hydrogen peroxide that still may be present. She knows that by keeping the hydrogen peroxide cold and in the dark that it will have a longer shelf-life. But she has moved several times and does not know how old the dilute hydrogen peroxide is that remains. We are providing you with a standardized solution of potassium permangangate of 0.1057 M that you will use in the buret as the titrant. You will use a 20.00 mL sample of that old dilute hydrogen peroxide and determine the percent by mass. The beginning volume in the buret was 0.75 mL and the final volume to be 29.79 mL which allowed a faint pink color to persist for 30 s. How many moles of potassium permanganate solution was used in this experiment? b. How many moles of hydrogen peroxide were titrated in the 20.00 mL of solution? c. What is the mass of the hydrogen peroxide? d. If the density of the old dilute hydrogen peroxide solution was 0.9987 g/mL, what was the mass of the analyte that you titrated? e. What was the percent by mass of the old diluted hydrogen peroxide solution

Answer 1