Copper oxide reacts with dilute sulfuric acid to form aqueous solution. A mixture contains carbon and copper oxide only. Plan an experiment to produce a sample of pure carbon from the mixture. No other chemicals are available except those mentioned and water.
Answers
Answer:
In this experiment an insoluble metal oxide is reacted with a dilute acid to form a soluble salt.
Explanation:
In this experiment an insoluble metal oxide is reacted with a dilute acid to form a soluble salt. Copper(II) oxide, a black solid, and colourless dilute sulfuric acid react to produce copper(II) sulfate, giving a characteristic blue colour to the solution. From this solution, blue copper(II) sulfate pentahydrate crystals can be obtained.
Procedure
Stage 1
a Add 20 cm3 of the 0.5 M sulfuric acid to the 100 cm3 beaker. Heat carefully on the tripod with a gentle blue flame until nearly boiling.
b When the acid is hot enough (just before it starts to boil), use a spatula to add small portions of copper(II) oxide to the beaker. Stir the mixture gently for up to half a minute after each addition.
c
When all the copper(II) oxide has been added, continue to heat gently for 1 to 2 minutes to ensure reaction is complete. Then turn out the Bunsen burner. It may be wise to check (using pH or litmus paper) that no acid remains. If the acid has not been hot enough, excess acid can co-exist with copper oxide.
SAFETY: Boiling off the water so that the copper sulfate appears and then decomposes with excessive heating is unsafe. The sulfur dioxide gases are toxic and can cause breathing difficulties.
d
Allow the beaker to cool slightly while you set up Stage 2.
Stage 2
e Place the filter funnel in the neck of the conical flask.
f Fold the filter paper to fit the filter funnel, and put it in the funnel.
g Make sure the beaker is cool enough to hold at the top. The contents should still be hot.
h Gently swirl the contents to mix, and then pour into the filter paper in the funnel. Allow to filter through.
i A clear blue solution should collect in the flask. If the solution is not clear, and black powder remains in it, you will need to repeat the filtration.
Stage 3 (optional)
j Rinse the beaker, and pour the clear blue solution back into it. Label the beaker with your name(s). Leave the beaker in a warm place, where it won’t be disturbed, for a week or so. This will enable most of the water to evaporate.
k Before all the water has evaporated, you should find some crystals forming on the bottom of the beaker. Filter the solution. Collect the crystals from the filter paper onto a paper towel.
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