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TGW3:
‘Think for Yourself’ questions on sulfuric acid
and copper oxide
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What
tells you there is a chemical reaction?
The copper oxide is ‘used up’.
A blue substance is formed: this is dissolved in the water
to give a clear, blue solution.
Is it possible to tell how many new substances have been formed?
No. We know there must be at least
one which is blue, but we don’t know if there are any
others dissolved in the water which are not coloured.
Why does the same thing happen when the second amount of copper
oxide is added?
The first amount was not enough to
react with all of the sulfuric acid.
Why is the solution a darker blue after the second amount
reacts?
There is more of the blue substance
in solution. It is more concentrated.
How would you know when you had added enough copper oxide
to react with all of the sulfuric acid?
There would be copper oxide left,
which would be visible (as it does not dissolve in water).
How could you separate out the left over copper oxide?
Filter the mixture. A clear blue
solution should drip through the filter paper.
How could you separate out what was dissolved?
Leave it for the water to evaporate.
There could be substances that evaporate with the water,
but it is worth trying first.
What do you think the blue substance is?
Copper sulfate. Evaporating the water
from the blue solution should leave this as crystals.
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Science Enhancement Programme CD-ROM 2005 |
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user
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