Two substances, C and D, were analysed. Solid C was a salt and solution D was an aqueous solution of chromium(III) chloride.
The tests on solid C, and some of the observations, are in the following table.
Identify solid C.
Describe the appearance of solution D.
Tests were carried out on solution D. Complete the observations for tests 1, 2 and 3.
i) Test 1
Drops of aqueous sodium hydroxide were added to solution D.
Excess aqueous sodium hydroxide was then added to the mixture.
Observations:
[3]
ii) Test 2
Excess aqueous ammonia was added to solution D.
Observations:
[2]
iii) Test 3
Dilute nitric acid was added to solution D followed by aqueous silver nitrate.
Observations:
[1]
Chromium(III) can be converted to chromium(VI). Chromium(VI) is hazardous.
Suggest one safety precaution when using chromium(VI).
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