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Test
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Play Movie
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Observations
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| 1)
Put half of your sample of R into a hard glass tube
and heat strongly until no further change is observed. You
should test for the gas evolved. Allow the residue to cool.
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1a)
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| Solution
S has been prepared for you by dissolving the residue
from Test 1 in dilute nitric acid. Use solution S for
Tests 2 and 3. |
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2a)
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).
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2a)
2b)
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| 3)
To a portion of solution S, add aqueous potassium iodide. |
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3)
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4a) To a portion of solid R,
add a small volume of dilute sulphuric acid followed by
an equal volume of aqueous potassium iodide. Allow the mixture
to stand for a few minutes.
b) Pour off some of the solution
from (a) into a clean test tube and then add an equal volume
of aqueous sodium thiosulphate.
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4a)
4b)
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| 5)
To a portion of solid R, add a small volume of concentrated
hydrochloric acid and leave to stand for a few minutes, shaking
occasionally. |
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5)
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When the reaction in Test 5 has
stopped, add distilled water until the test-tube is about
half full. Allow any solid to settle and pour off the solution
into a clean test-tube and use this solution for Tests 6
and 7.
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6a)
To a portion of solution from Test 5, add aqueous sodium hydroxide
until a change is seen.
b) Add excess aqueous sodium hydroxide to the mixture from(a).
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6a)
6b)
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7a) To a portion of solution of
solution from Test 5, add a few drops of aqueous potassium
iodide.
b) Add excess aqueous potassium
iodide to the mixture from (a).
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7a)
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