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Rusting Lab. Hypothesis: I think that the presence of salt will speed up the rusting. The greater the amount of salt present in the test tube, the faster/more the iron nails will rust.

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Introduction

Chemistry Lab Report Aim: To investigate a factor that affect the rusting of iron nails. The factor investigated for the experiment is: * Amount of salt Background: in contact with water and oxygen, or other strong oxidants and/or acids, iron will rust. If salt is present as, for example, in salt water, it tends to rust more quickly, as a result of the electro-chemical reactions. Iron metal is relatively unaffected by pure water or by dry oxygen. As with other metals, a tightly adhering oxide coating, a passivation layer, protects the bulk iron from further oxidation. Thus, the conversion of the passivating iron oxide layer to rust results from the combined action of two agents, usually oxygen and water. Other degrading solutions are sulfur dioxide in water and carbon dioxide in water. Hypothesis: I think that the presence of salt will speed up the rusting. ...read more.

Middle

3, 0.6g of NaCl to add to test tube 4, 0.8g of NaCl to test tube 5 and 1.0g of NaCl to test tube 6 leaving test tube 1 without salt. 5. Secure each test tube with a rubber bung. 6. Wait for a week. 7. Re-weigh each set of nails from their test tubes and note these down. Results: Raw Data Table: Test Tube Number Initial Mass of Iron Nails (�0.005g) Mass of NaCl added (�0.05g) Final Mass of Iron Nails (�0.005g) 1 0.51 0.0 0.52 2 0.50 0.2 0.52 3 0.51 0.4 0.53 4 0.49 0.6 0.53 5 0.50 0.8 0.55 6 0.51 1.0 0.57 Processed Data Tables: To find the mass of the rust(hence, the amount of rust): Mass of rust = Final Mass of Iron Nails - Initial Mass of Iron Nails Test Tube Number Mass of NaCl Increase in mass of Iron Nails (Mass of rust) ...read more.

Conclusion

50g. This is a 12% increase showing that, adding 1g of salt to iron nails in 10ml of water causes a production of rust that is 125 the weight of the submerged iron nails. Conclusion: The amount of rust increases almost in proportion to the amount of salt added. This is because salt water is a good conductor of electricity and ,given that rusting is a redox reaction, the greater the presence of salt the electron transfer occurs more rapidly. Evaluation: The experiment was carried out well but there were points that could be improved on. * Some of the rust floated into the water and was thus not taken into account during the calculations. Fair test: * The test tubes were secured with a rubber bung so that the ambient changes in the chemistry lab would not affect the experiment. * The water was free from impurities that could alter the readings. * All apparatus, conditions and time were kept constant. ...read more.

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