32 Peroxide Calc

# 32 Peroxide Calc - Calculator Potentiometric Titration of...

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Advanced Chemistry with Vernier 32 - 1 Calculator 32 Potentiometric Titration of Hydrogen Peroxide One method of determining the concentration of a hydrogen peroxide, H 2 O 2 , solution is by titration with a solution of potassium permanganate, KMnO 4 , of known concentration. The reaction is oxidation-reduction and proceeds as shown below, in net ionic form. 5 H 2 O 2 (aq) + 2MnO 4 (aq) + 6 H + (aq) 5 O 2 (g) + 2 Mn 2+ (aq) + 8 H 2 O (l) In this experiment, you will use an ORP (Oxidation-Reduction Potential) Sensor to measure the potential of the reaction. Your data will look like an acid-base titration curve. The volume of KMnO 4 titrant used at the equivalence point will be used to determine the concentration of the H 2 O 2 solution. Your sample of H 2 O 2 will come from a bottle of ordinary, over-the-counter hydrogen peroxide purchased at a grocery or a drug store. The concentration of this product is labeled as 3% mass/volume, which is ~0.9 M. OBJECTIVES In this experiment, you will Conduct the potentiometric titration of the reaction between commercially available hydrogen peroxide and potassium permanganate. Measure the potential change of the reaction. Determine the concentration of the hydrogen peroxide solution. Figure 1

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32 - 2 Advanced Chemistry with Vernier Calculator 32 CHOOSING A METHOD If you choose Method 1 , you will conduct the titration in a conventional manner. You will deliver volumes of MnO 4 titrant from a buret. You will enter the buret readings manually to store and graph each potential-volume data pair. If you choose Method 2 , you will use a Vernier Drop Counter to conduct the titration. MnO 4 titrant is delivered drop by drop from the reagent reservoir through the Drop Counter slot. After the drop reacts with the reagent in the beaker, the volume of the drop is calculated and a potential-volume data pair is stored. MATERIALS Materials for both Method 1 (buret) and Method 2 (Drop Counter) LabPro or CBL 2 interface 250 mL beaker TI graphing calculator magnetic stirrer (if available) Vernier ORP Sensor stirring bar or Microstirrer (if available) 3% hydrogen peroxide, H 2 O 2 , solution wash bottle 0.020 M potassium permanganate solution, KMnO 4 , in H 2 SO 4 distilled water ring stand 4.5 M sulfuric acid, H 2 SO 4 , solution utility clamp 50 mL graduated cylinder Materials required only for Method 1 (buret) 50 mL buret buret clamp 10 mL pipet and pump Materials required only for Method 2 (Drop Counter) Vernier Drop Counter 100 mL beaker 60 mL reagent reservoir 10 mL graduated cylinder 5 mL pipet a second 250 mL beaker METHOD 1: Measuring Volume Using a Buret 1. Obtain and wear goggles. 2. Prepare an acidified and diluted hydrogen peroxide, H 2 O 2 , solution for the titration. a. Measure out precisely 10.0 mL of a 3% hydrogen peroxide solution and add 90.0 mL of
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32 Peroxide Calc - Calculator Potentiometric Titration of...

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