Investigating for Cations and Anions

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Recommended: Importance of safety in the lab

Investigating for Cations and Anions

In this experiment I will investigate what cations and anions are

present in various compounds. This will include carrying out a

qualitative analysis, because I need to find out what type of cations

and anions are there and not quantitative analysis, which includes

finding out how much of each element there is.

Safety Points:

· Wear glasses

· Wear gloves

· Do not mix more than two solutions

· Only mix the solutions listed by the teacher

· Handle the chemicals with extreme care

· Put the chemical solutions into a test-tube which is resting on a

test-tube holder

· Follow school lab safety procedures.

Materials:

· Various chemicals.

· Test tubes.

· Boiling tubes.

· Pipettes.

· Test tube holder.

· Bench mat.

Method

· I first copied the chemical solutions listed.

· I put on some gloves and safety glasses.

· I got a test-tube holder and placed five test-tubes in it.

Cations

· I added the test solutions Copper Chloride to the test-tube.

· To this I added a few drops of Sodium Hydroxide solution.

After the few drops a pale blue precipitate of Copper Hydroxide

appeared that indicated the presence of Cu ions.

· I then added the test solution Iron Chloride to the second

test-tube.

· To this I added a few drops of Sodium Hydroxide.

· After that a brown precipitate of Iron Hydroxide appeared that

indicated the presence of Fe ions.

· To the 3rd test-tube, I added the solution Sodium Hydrogen Carbonate

and added Dilute Sodium Hydroxide.

· I quickly covered the test-tube with a delivery tube and put the end

of it into another test-tube with limewater.

· The limewater turned a cloudy/milky colour which indicated that

there was CO present.

Anions

· In the 4th test-tube, I poured the solution Copper Chloride into the

test-tube.

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