Experiment 1 .docx - EXPERIMENT 1 Title The Potentiometric Titration of Hydrogen Peroxide Objectives In this experiment the aim is to conduct the

Experiment 1 .docx - EXPERIMENT 1 Title The Potentiometric...

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EXPERIMENT 1 Title : The Potentiometric Titration of Hydrogen Peroxide Objectives: In this experiment, the aim is to conduct the potentiometric titration of the reaction between commercially available hydrogen peroxide and potassium permanganate. Furthermore, to measure the potential change of the reaction. Finally, is to determine the concentration of the hydrogen peroxide solution. INTRODUCTION: Hydrogen peroxide us topical antiseptic commonly used to treat cuts and wounds to prevent infection. However, hydrogen peroxide is relatively unstable and decomposes to form water and oxygen gas: H 2 O 2 (aq) →H 2 O(l) + O 2 (g) In daily life, the percentage is probably not exact 3%. One method of determine the concentration of a hydrogen peroxide, H 2 O 2 , which 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) + 6H + (aq) → 5O 2 (g) + 2Mn 2+ (aq) + 8H 2 O (l) In this experiment, an ORP (Oxidation-Reduction Potential) Sensor used to measure the potential of the reaction. The ORP sensor is based on Standard Hydrogen Electrode (SHE) as a reference. It can detect pH, temperature and potential of the solution. The 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.
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Experimental procedure: 1. An acidified and diluted hydrogen peroxide, H 2 O 2 , is prepared as solution for the titration a) 100mL of 0.3% H 2 O 2 from stock solution of 3% H 2 O 2 is prepared. b) 10mL of the diluted H 2 O 2 solution is measured out precisely into a 250mL beaker. 25mL of distilled water and 10 mL of 4.5 M sulfuric acid, H 2 SO 4 , solution is mixed carefully. CAUTION: H 2 SO 4 is a strong acid and should be handled with care.
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