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F336-hydrogen peroxide individual investiation

Extracts from this document...

Introduction

Contents Section Page Planning 3-5 Method 5-7 Risk Assessment 7-9 Results and Evaluation 9-21 references 22-23 An investigation to show the effects of Manganese (IV) Oxide catalyst (MnO2) and Catalase on the decomposition of Hydrogen Peroxide (H2O2) Planning Using two catalysts at two different temperatures, Manganese (IV) Oxide and Catalase, I can then determine which is the most effective catalyst by examining the different activation enthalpies Hydrogen peroxide is made by quite a few enzymes in the body. Hydrogen Peroxide is a poisonous by-product of metabolism, this can kill cells. In particular, some enzymes breaking down certain amino acids and fatty acids (D-amino acid oxidase and acyl-CoA oxidase) make significant amounts of hydrogen peroxide. Since hydrogen peroxide can be damaging to normal tissue, these enzymes are kept inside specialized organelles inside cells called peroxisomes. The peroxisomes also contain large amounts of catalase to breakdown the hydrogen peroxide before it can escape. 1 Catalase is also found in food such as potato and liver. Catalase breaks down the Hydrogen Peroxide molecule because the shape of the molecule matches the active site of the catalase enzyme. The equation below is the breaking down of Hydrogen Peroxide into water and Oxygen. 2H2O2 (aq) --> 2H2O (l) + O2 (g) Hydrogen Peroxide is also broken down by inorganic catalysts such as Manganese (IV) ...read more.

Middle

Hydrogen peroxide is also a strong bleach. Contact with my clothes and skin, can change the colour of my clothes or skin. Therefore I should wear a lab coat and a pair of gloves. The symptoms and the steps to take if poisoned by hydrogen peroxide, if hydrogen peroxide were to come in contact with your eyes. You should wash it with cold water and seek immediate medical attention. To prevent this, I should wear plastic goggles. If hydrogen peroxide is swallowed, the victim should get a burning sensation in their mouth and throat, they should drink plenty of water, should not be made to vomit, and seek immediate medical attention. Care should also be taken when removing the cap on a hydrogen peroxide bottle, because of build up of gas pressure. Manganese (IV) Oxide Principal Hazards- harmful if you swallow or inhaled Safe Handling- wear safety goggles, and work in well ventilated area Emergency- Eye Contact- Immediately flush the eye with water, and keep washing with water for several minutes. If irritation persists, call for medical help. Skin Contact- wash off with soap and water If swallowed- wash out the mouth, and seek medical help It is dangerous if it comes in contact with aluminium and other metal powders. ...read more.

Conclusion

Percentage error= (0.05/12) x 100 = 0.42% * 8cm3 with an error of (+/- 0.05%) Percentage error= (0.05/8) x 100 = 0.63% I will then measure out 1 Gram of Manganese(IV) oxide on a balance (2dp) * 1 gram with an error of 0.005% Percentage error= (0.005/1) x 100 = 0.5% The stopwatch I was using could also contain a vital error. Firstly it could contain factory defect meaning it could be a few second out which could affect my results especially for the initial rate. The stop watch only gave values to a certain degree of accuracy therefore has an error of +/-0.01s. My first reading was at 24 seconds so: Percentage error = (0.01/24) x 100 = 0.04% Equipment Error Significance The Burette, different concentrations of H2O2 20% H2O2 + 80% H20 1.56% Due to it having a large error and used for making the hydrogen peroxide solution then it is possible that it altered the overall concentration of the reaction 30% H2O2 + 70% H2O 1.19% 40% H2O2 + 60% H2O 1.05 50% H2O2 + 50% H2O 1% 60% H2O2 + 40% H2O 1.05% The Balance 0.5% Small error likely to have insignificant significance The stopwatch 0.04% Small error and was not stopped during the reaction so error is likely to be insignificant. Cumulative Error: 6. ...read more.

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