Experiment Prac Writeup. for reactions between metals and oxygen, water, dilute water and dilute alkali.

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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

Sandpaper

Diagram:

METHOD:

Part A: Reaction With Oxygen

Caution: Steps 1 and 2 are best done as a teacher demonstration

1. Place a piece of calcium on a gauze mat on a tripod and direct a hot bunsen flame onto it. Observe And Record Results

Warning: Magnesium burns with a bright light so do not look directly at burning magnesium

2. Using Metal Tongs hold a clean piece of magnesium ribbon in a Bunsen flame until it ignites

3. Clean pieces of iron, copper, aluminium and zinc with sandpaper. Repeat step 2 with each of these. Not any changes in appearance

Part B: Reaction With Water

1. Clean a small piece of each of the metals listed using sandpaper, except calcium which can be used without cleaning

2. Place each piece in a separate test tube and add about 5mL of distilled water 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 heat the test tube in a quiet Bunsen burner until the water boils. Observe and Record Any Changes

Part C: Reaction With Hydrochloric Acid

1. Clean a small piece of each of the metals listed (except calcium) using sandpaper

2. 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 acid

Pard D: Reaction with alkali

1. Clean a small piece of each of the metals listed (except calcium) using sandpaper

2. 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 calcium

Caution: These reactions may not occur immediately so leave standing for a few minutes. Be warned they can become quite vigorous after an initial delay

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.

Results:

Metal Reaction With Oxygen Reaction With Water Reaction With Dilute Acid Reaction With Conc. Acid Reaction With Alkali

Calcium

Copper Reacted No Reaction No Reaction Reacted No Reaction

Iron Reacted No Reaction No Reaction Reacted No Reaction

Magnesium Reacted No Reaction Reacted Reacted No Reaction

Zinc Reacted No Reaction No Reaction Reacted No Reaction

Aluminium Reacted No Reaction No Reaction Reacted Reacted

Discussion:

This experiment has allowed the understanding about the different reactions...
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