Learn about the preparation and standardization of 0.1 M ferrous ammonium sulfate solution through a laboratory experiment or practical.
Aim:
To prepare and standardize 0.1 M ferrous ammonium sulphate solution using 0.1 M solution of ceric ammonium sulphate.
Requirements:
Glasswares:
Burette, burette stand, conical flask, volumetric pipette, beaker, volumetric flask, funnel, glass rod, wash bottle, etc.
Chemicals:
LR grade ferrous ammonium sulphate (FeH8N2O8S2), ceric ammonium sulphate ((NH4)4Ce (SO4)4), ortho-Phenanthroline (C36H24FeN6+2), sulphuric acid (H2SO4), etc.
Apparatus:
Digital/analytical balance, and Ultrasonicator.
Preparation of 0.1 M ferrous ammonium sulphate solution:
Take 160 ml of distilled water, add 40 ml of sulphuric acid, and once it is cooled then weigh 40 gm of ferrous ammonium sulphate and add it. Once it has completely dissolved, make up the volume to 1000 ml.
Titration procedure:
- All glassware should be cleaned and dried according to standard laboratory procedures.
- Before filling the burette for the titration, rinse it with distilled water and then pre-rinse it with a portion of the titrant solution. Pre-rinsing is required to make sure that all solution in the burette is the desired solution, not a contaminated or diluted solution.
- Take the unknown stock solution of titrant in a clean and dry beaker then fill the burette using the funnel.
- Remove air bubbles from the burette and adjust the reading to zero.
- Take 25.00 ml of prepared solution of ferrous ammonium sulphate and pour it into a conical flask.
- Add 2 drops of ortho-Phenanthroline indicator.
- Titrate the sample solution with 0.1M ceric ammonium sulfate until the endpoint is reached. The actual endpoint of the reaction is red color changes to a blue one.
- Properly record the readings of the burette.
- To get accurate results, repeat the titration three times.
- Take their mean and calculate the molarity of ferrous ammonium sulphate.
- 01 ml of ceric ammonium sulphate is equivalent to 0.03921 gm of Fe (NH4)2(SO4)2,6H2O.
Observation table:
|
Sr. No. |
Content in conical flask |
Burette reading |
Volume of titrant used (ml) |
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|
Initial |
Final |
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1 |
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2 |
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3 |
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Mean: |
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Result:
The strength of the prepared ferrous ammonium sulphate solution was found to be_____M.
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