Qualitative Analysis of cations Cu2+, Fe2+, Fe3+ (Module 3 ...
Qualitative Analysis of cations Cu2+, Fe2+, Fe3+ (Module 3) Skills tested: None
Aim: To observe preliminary and confirmatory reactions of copper(II) ions, iron(II) and iron(III) ions
Write a full lab report. Use of tabular form is suggested. Equations must be shown for each reaction in both stages.
Preliminary Tests
1. a) To a 2 cm3 sample of aqueous Cu2+ ions, add a small amount of sodium hydroxide and record your observation.
Decant about ½ to ¾ of the mixture and add another small amount of sodium hydroxide and again record your observation.
b) Repeat test 1a) using aqueous ammonia as the reagent instead of sodium hydroxide solution.
2. Repeat all of test 1 using aqueous Fe2+ as the sample instead of aqueous Cu2+ ions.
3. Repeat all of test 1 using aqueous Fe3+ as the sample instead of aqueous Cu2+ ions.
Confirmatory Tests
4. a) To a 2 cm3 sample of aqueous Cu2+ ions, add a small amount of aqueous potassium iodide.
b) Decant ¾ of the mixture from test 4 a) and add sodium thiosulphate solution until there is no further change
5. To a 2 cm3 sample of aqueous Cu2+ ions, add a small amount of potassium hexacyanoferrate(II) solution.
6. To a 2 cm3 sample of aqueous Fe2+ ions, add a small amount of potassium hexacyanoferrate(III) solution.
7. To a 2 cm3 sample of aqueous Fe3+ ions, add a small amount of potassium hexacyanoferrate(II) solution.
8. To a 2 cm3 sample of aqueous Fe3+ ions, add a small amount of ammonium thiocyanate solution.
Treatment of results
1. Some tests are qualitative in nature and others are quantitative in nature. What is the difference between qualitative and quantitative analyses?
2. What is the nature of a preliminary test in reference to qualitative analysis.
3. Some ions such as sodium ions and potassium ions do not readily form precipitates with common lab reagents. What other qualitative analyses can be done to detect the presence of these ions? State what would be the observations for qualitative analyses previously mentioned for sodium and potassium ions.
4. Thiocyanate ions can detect the presence of very small amounts of Fe3+ ions. However iron(II) ions and thiocyanate should form a colourless complex. Suggest an explanation for a crimson colour seen when iron(II) ions and thiocyanate ions are mixed under ordinary school laboratory conditions.
Qualitative Analysis of cations Cu2+, Fe2+, Fe3+ (Module 3) Skills tested: None
Aim: To observe preliminary and confirmatory reactions of copper(II) ions, iron(II) and iron(III) ions
Write a full lab report. Use of tabular form is suggested. Equations must be shown for each reaction in both stages.
Preliminary Tests
1. a) To a 2 cm3 sample of aqueous Cu2+ ions, add a small amount of sodium hydroxide and record your observation.
Decant about ½ to ¾ of the mixture and add another small amount of sodium hydroxide and again record your observation.
b) Repeat test 1a) using aqueous ammonia as the reagent instead of sodium hydroxide solution.
2. Repeat all of test 1 using aqueous Fe2+ as the sample instead of aqueous Cu2+ ions.
3. Repeat all of test 1 using aqueous Fe3+ as the sample instead of aqueous Cu2+ ions.
Confirmatory Tests
4. a) To a 2 cm3 sample of aqueous Cu2+ ions, add a small amount of aqueous potassium iodide.
b) Decant ¾ of the mixture from test 4 a) and add sodium thiosulphate solution until there is no further change
5. To a 2 cm3 sample of aqueous Cu2+ ions, add a small amount of potassium hexacyanoferrate(II) solution.
6. To a 2 cm3 sample of aqueous Fe2+ ions, add a small amount of potassium hexacyanoferrate(III) solution.
7. To a 2 cm3 sample of aqueous Fe3+ ions, add a small amount of potassium hexacyanoferrate(II) solution.
8. To a 2 cm3 sample of aqueous Fe3+ ions, add a small amount of ammonium thiocyanate solution.
Treatment of results
1. Some tests are qualitative in nature and others are quantitative in nature. What is the difference between qualitative and quantitative analyses?
2. What is the nature of a preliminary test in reference to qualitative analysis.
3. Some ions such as sodium ions and potassium ions do not readily form precipitates with common lab reagents. What other qualitative analyses can be done to detect the presence of these ions? State what would be the observations for qualitative analyses previously mentioned for sodium and potassium ions.
4. Thiocyanate ions can detect the presence of very small amounts of Fe3+ ions. However iron(II) ions and thiocyanate should form a colourless complex. Suggest an explanation for a crimson colour seen when iron(II) ions and thiocyanate ions are mixed under ordinary school laboratory conditions.
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