The Laboratory Challenge

Lab Challenge 5

Modified GCE `O' Level Chemistry Practical

Observe the following demo experiment on solution S. Record your observations in the table given. You should identify and name any gas evolved.

Solution S
Test
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Observations

1a) To a portion of solution S, add aqueous sodium hydroxide until a change is seen.

b) Add excess aqueous sodium hydroxide to the mixture from (a).

1a)
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1b)
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2a) To a portion of solution S, add aqueous ammonia until a change is seen.

b) Add excess aqueous ammonia to the mixture from (a).

2a)
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2b)
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3a) To a portion of solution S, add an equal volume of aqueous Barium nitrate and leave to stand fora few minutes.

b) Add dilute nitric acid to the mixture in (a).

3a)
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3b)
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4) To a portion of S in a boiling tube, slowly add an equal volume of aqueous sodium chlorate(I).Warm the mixture from (a) gently. Allow the mixture to cool and use it for Test 5.

4)
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5) To the mixture in Test 4, add an equal volume of aqueous hydrogen peroxide.

5)
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Conclusions
The formula of the anion (negative ion) present in solution S is


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