What is a cation? - ANSWERSA positively charged ion.
Adding dilute sodium hydroxide:
1. What can this test be used on? (2)
2. What are the results of this test an application of? - ANSWERS1.
*Group 2 metal ions.
*Transition metal ions.
2. This is an application of the trend that group II...
AQA A-Level Chemistry Required
Practical 4: Identifying cations and
anions (3.2.2 & 3.2.3) Questions &
Answers
What is a cation? - ANSWERSA positively charged ion.
Adding dilute sodium hydroxide:
1. What can this test be used on? (2)
2. What are the results of this test an application of? - ANSWERS1.
*Group 2 metal ions.
*Transition metal ions.
2. This is an application of the trend that group II hydroxides become more soluble
down the group.
Adding dilute sodium hydroxide: The method.
1. What is done first?
2. What do we add next? How should we mix the reagents?
3. How should we continue to add sodium hydroxide solution? When should we stop? -
ANSWERS1. We add about 10 drops of 0.1 moldm-3 of metal ion solution to a test
tube.
2. We add about 10 drops of 0.6 moldm-3 of sodium hydroxide solution. We should mix
them well.
3. We should continue add sodium hydroxide solution dropwise with gentle shaking. We
should stop when sodium hydroxide is in excess.
Required Practical 4: Testing for cations, Group 2.
1. Why don't strontium and barium salts form a hydroxide precipitate on the addition of
sodium hydroxide?
2. What will their solutions be like? - ANSWERS1. They are highly soluble in water.
2. Highly alkaline.
Testing for ammonium ions.
1. State the chemical formula for an ammonium ion.
2. What is done first when testing for ammonium ions?
3. What do we next? (2)
4. How do we warm the mixture?
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