The Reaction of Metals with Hydrochloric Acid

1 Weigh out approximately 0.1 g. of each metal. Place each sample in a separate, labelled boiling tube. Note the state (powder, sheet, block, etc.) and colour of each sample. Record all your observations as you make them

2 Collect a beaker and measure 150 cm3 of dilute hydrochloric acid (the chemical formula is HCl(aq)) into it.

3 Add sufficient acid to half-fill one of the boiling tubes.

4 Note what happens and record your observations as you make them. Not all the metals will react. If a reaction occurs, record the time taken for the metal to disappear, and test any gas evolved with a lighted splint. If no reaction occurs after one minute, gently warm the mixture over a Bunsen burner flame and record any new observations. Again, test any gases evolved with a lighted splint.

Points to note :

Write up the experiment as you proceed.

Safety spectacles must be worn at all times.

Do NOT boil the acid directly over the bunsen burner.

Donot rush the experiment.

Questions

(i) Write down the chemical symbols of the metals you have used.

(ii) Using your observations, attempt to put the metals in some sort of order of reactivity.

(iii) What factors might influence the rate at which the metals react with the acid?

(iv) Name the gas(es) given off in this experiment.

(v) Write word equations for all the reactions occurring in this experiment, bearing in mind that the acid used here forms chloride compounds.