Experiment Prac Writeup. For Reactions Between Metals And Oxygen, Water, Dilute Water And Dilute Alkali

1637 words - 7 pages

Aim: To conduct reactions between various metals and oxygen,water,dilute water and dilute alkali to make decisions about their reactivity.Equipment:* 5 Small pieces of each of calcium, copper, iron, magnesium, zinc and aluminium* 35mL dilute (1 mol/L) hydrochloric acid (HCl)* 10ml conc (8 mol/L) hydrochloric acid (HCl)* 35ml dilute (1 mol/L) Sodium Hydroxide (NaOH)* 10 ml dilute (1 mol/L) sulfuric acid (H2SO4)* 14 test tubes* test tube rack* test tube holder taper matches tripod Bunsen Burner Gauze Mat Metal Tongs Distilled Water SandpaperDiagram:METHOD:Part A: Reaction With OxygenCaution: Steps 1 and 2 are best done as a teacher ...view middle of the document...

Place each piece in a sperate test tube and add about 5 mL of dilute Hydrochloric Acid to each. Observe and record any change.3. If Reaction occurs collect the gas by inverting another test tube over the one in which the reaction I occurring. Test the hydrogen by placing a lit taper near the mouth of the test tube. A 'pop' shows hydrogen is present.4. If, after a couple of minutes, no reaction occurs add about 5 mL of concentrated acid to the same test tube containing the unreacting metal. Observe and record any changes. Do not test metals which react with dilute acid.5. Would you expect the metals to react differently if diulute sulfuric acid were used instead of dilute hydrochloric acid? Why? Test your expectations by reacting magnesium and iron with 3 mL dilute sulfuric acidPard D: Reaction with alkali1. Clean a small piece of each of the metals listed (except calcium) using sandpaper2. Place each piece in a sperate test tube and add about 5mL of sodium hydroxide to each. Observe and record any change. Do not perform this test on calciumCaution: These reactions may not occur immediately so leave standing for a few minutes. Be warned they can become quite vigorous after an initial delay3. If Reaction occurs collect the gas by inverting another test tube over the one in which the reaction I occurring. Test the hydrogen by placing a lit taper near the mouth of the test tube. A 'pop' shows hydrogen is present.Results:Metal Reaction With Oxygen Reaction With Water Reaction With Dilute Acid Reaction With Conc. Acid Reaction With AlkaliCalcium Copper Reacted No Reaction No Reaction Reacted No ReactionIron Reacted No Reaction No Reaction Reacted No ReactionMagnesium Reacted No Reaction Reacted Reacted No ReactionZinc Reacted No Reaction No Reaction Reacted No ReactionAluminium Reacted No Reaction No Reaction Reacted ReactedDiscussion:This experiment has allowed the understanding about the different reactions metals have with different mediums. Throughout the experiment several reactions occurred between the metals and oxygen, water, dilute acid, concentraded acid and alkali. However some of the results were not supported by theoretical conclusions. None of the metals during the experiment reacted with water, but this is wrong since it is known Magnesium and Iron should have reacted since the formulae of the reaction that occurred were:Mg(s) + 2H2O (l) Mg(OH)2(aq) + H2(g)Fe(s) + 2H2O (l) 2Fe(OH)2(aq) + H2(g)Possible Reasons for this practical error is that because the metals take a long time to react with the water, due to the time we had to perform it, the metal was not able to completely react with the water in the...

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