quantitative determination of nickel in a compound
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Quantitative determination of nickel in a compound. Go to browse and set to full screen. Part 1. Beaker tongs. Crucibles. Desicooler. Crucible tongs. Drying agent. - PowerPoint PPT PresentationTRANSCRIPT
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Quantitative determination of
nickel in a compound
Go to browse and set to full screen.
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DesicoolerCrucibles
Crucible tongs
Beaker tongsPart 1
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Drying agent
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Obtain two crucibles from the oven, put the lid on
and let them cool on the bench top for 20 min.
Then weigh them accurately on the analytical
balance.
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Use crucible tongs to transfer crucible to analytical balance.
Record the mass in your notebook.
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Homogeneous precipitation
To a clean 400 mL beaker add about 200 mL of distilled water and 5 drops of 6 M HCl.
Part 2
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Add 15.00 mL of your unknown solution to the solution in 400 mL beaker.
Waste beaker
Record the unknown number in your notebook.
15.00 mL pipet
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Place this dilute acidic nickel solution on a hot plate in the fume hood.
Set the hot plate on medium heat.
Steaming nickel solution.
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Add about 20 g of urea.
Weigh on the triple beam balance.
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Add 20 mL of 1% DMG solution to the hot nickel solution.
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Cover the beaker with watch glass and let the solution heat for one hour.
After one hour the solution should be colorless with a red precipitate dispersed in it.
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Pipet 15.00 mL of your unknown Ni solution into a clean 600 mL beaker.
Heterogeneous precipitationPart 3
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Add 350 mL distilled water,
2.50 g of NH4Cl.
And then add 2.5 mL of concentrated ammonia.
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lift plunger carefully
press down slowly
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Homogeneous solution
from part 2
Heterogeneous solution
Place the beaker on the hot plate.
Add about 20 mL of the 1% DMG reagent to the solution.
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After adding 20 ml of 1% DMG (heterogeneous solution) stir well for 20 minutes or until the precipitate settles.
Let it cool for 5 minutes.
Then place it in an ice-water bath for 10 min.
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black vacuum (rubber) tubing
vacuum filter flask
rubber cone utility clamp
stand
crucible
aspirator
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Filter the solution through one of the pre-weighed crucible.
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Rinse beaker several times with the small quantity of cold distilled water.
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After one hour add 5 drops of 6 M ammonia solution and swirl. Remove the solution from the heat. Let it cool for 5 minutes, then place it in ice-water bath for 10 minutes and repeat the filtration through one of the pre-weighed crucible.
Back to part 2 – homogeneous precipitation.
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Homogeneous precipitate
Heterogeneous precipitate
Place them in the oven and dry to constant mass.
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Do final weighing to obtain the mass of precipitate.