Practical Skills Revision 2

What can you deduce from the test instructions?

Place 1 cm³ of solution P in a large test-tube.

Add 1 cm³ of dilute sodium hydroxide.

Gently warm the mixture and then boil it for one minute.

• Test for nitrate ions

• Test for ammonium ions

• Test for ammonia gas

• Test for cations

What can you deduce from the test instructions?

Place 1 cm³ of solution P in a test-tube.

Add 1 cm³ of dilute nitric acid followed by 1 cm³ of barium nitrate solution.

• Observe white ppt.

• This is a test for chloride ions

• This is a test for sulfate ions.

• Test for carbon dioxide if effervescence observed

What can you deduce from the test instructions?

Place 1 cm³ of solution P in a test-tube.

Add 1 cm³ of dilute nitric acid followed by 1 cm³ of silver nitrate solution.

• This is a test for chloride ions.

• This is a test for sulfate ions.

• Test for carbon dioxide if effervescence observed.

• Observe if white ppt formed.

Suggest why dilute nitiric acid is added when testing for chloride or sulfate ions.

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What can you deduce from the test instructions?

Place 1 cm³ of solution P in a test-tube.

Add 1 cm³ of sodium hydroxide and a piece of aluminium foil to the test tube and warm the mixture.

• Observe if ppt formed on adding sodium hydroxide

• Test for ammonia gas after adding sodium hydroxide and aluminium foil

• This is a test for cations.

• This is a test for nitrate ions.

What can you deduce from the test instructions?

Place about 3 cm³ of limewater in a clean test-tube.

Remove the stopper from the hard glass boiling tube labelled solid sample X.

Heat the boiling tube gently and then more strongly until no further changes are seen.

• Test for carbon dioxide

• Test for oxygen gas

• Note colour of ppt formed in solid X.

• Note colour change of solid X.

What can you deduce from the test instructions?

Place about 2 cm³ of solution Z in a clean test-tube.

Add 3 pieces of magnesium ribbon to the test-tube.

You will need to observe this test tube for a few minutes.

• Test for carbon dioxide

• Note colour change of magnesium ribbon

• Note colour of ppt formed in solution Z

• Note colour change of solution Z.