(i) Pour 5 cm of the acids in the table below into test-tubes. Place a piece of metal foil in
each test-tube. Note the formation of hydrogen and compare the different rates at which
the bubbles are formed.
Rate of formation of hydrogen gas - very rapid, rapid, slight, very slight, none
Metal (b) 3M hydrochloric acid (c) 3M sulphuric acid
Magnesium (b) Very rapid (c) Rapid
Aluminium (b) Slight (c) None
Zinc (b) Moderate (c) Slight
Iron (b) Very slight (c) Very slight
Tin (b) None (c) None
Lead (b) None (c) None
Copper (b) None (c) None
(ii) Recover the zinc after the reaction has ceased. Evaporate the solution to leave zinc
sulphate crystals. Dissolve the colourless zinc sulphate crystals in water and put two carbon
electrodes (central poles of dry cell batteries) in the solution. Connect the electrodes to a
6-volt or 12 volt DC supply. Zinc forms rapidly on the cathode.
sharon kalunda answered the question on April 12, 2019 at 08:36
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