1. Required Practical Guide Identification of ions/ species
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Required Practical Guide
Chemistry
Identification of ions/ species
This document contains:
Links to YouTube clips showing the practical procedure
Information from examination boards AQA, OCR, Edexcel
Potential examination questions and answers
This resource is strictly for the use of member schools for as long as they remain members of The PiXL Club. It may not be copied, sold nor transferred to a third party or used by the school after membership ceases. Until such time it may be freely used within the member school.
All opinions and contributions are those of the authors. The contents of this resource are not connected with nor endorsed by any other company, organisation or institution.
Commissioned by The PiXL Club Ltd. November 2016
The PiXL Club Ltd, Company number
© Copyright The PiXL Club Ltd, 2016

2. Required practical – exam boards
AQA

3. Practical procedure: Identification of ions/species
Click on each of the tabs to take you to a YouTube clip. Please note these are external sites to PiXL, PiXL does not control the content of these sites.
Video 1
Video 2

4. Possible examination style questions answers
Describe how to carry out a flame test in order to identify the Group 1 ion present in a compound.
A student suspected the white powder in the container was calcium carbonate. Describe the tests he could carry out to see if he was correct and the expected results of those tests.
What is meant by a ‘precipitation reaction’?
What colour precipitate will be produced in the following reactions with sodium hydroxide?
Copper sulfate
Iron II sulfate
Iron III sulfate

5. Possible examination style questions answers
Describe how to carry out a flame test in order to identify the Group 1 ion present in a compound.
ANS:
Dip flaming rod in water then in the substance being tested
Place in blue flame
Observe colour of flame
Red = Li; Yellow = Na; Lilac = K (any other relevant examples)

6. Possible examination style questions answers
A student suspected the white powder in the container was calcium carbonate. Describe the tests he could carry out to see if he was correct and the expected results of those tests.
ANS:
React with dilute acid
Test gas produced with limewater
Limewater cloudy = carbonate
Flame test
Calcium = orange/red

7. Possible examination style questions answers
What is meant by a ‘precipitation reaction’?
ANS:
2 solutions react
Form an insoluble solid

8. Possible examination style questions answers
What colour precipitate will be produced in the following reactions with sodium hydroxide?
Copper sulfate
Iron II sulfate
Iron III sulfate
ANS:
Blue precipitate
Light green/Green precipitate
Brown/ orange brown precipitate

9. Key questions: How do you carry out a flame test?
A flame test was carried out and a lilac flame was seen. Which ions are present?
Which ion in solution gives a blue precipitate when sodium hydroxide solution is added?
Which two ions in solution give the same colour precipitate when sodium hydroxide solution is added to them?
What further test can be done to distinguish between those two ions?
What is the test, and its result, for ammonia gas?
What is the test for a sulfate ion?

10. Key questions:
Which ion gives carbon dioxide gas when hydrochloric acid is added to it?
A yellow precipitate was formed when nitric acid and silver nitrate were added to a solution. Which ion is in the solution?
Why is nitric acid added to the solution before silver nitrate solution?

11. Summary document
A summary document is also available on Huddle which contains all the relevant information about this practical from the different examination boards. This document includes practical methods and other potential examination questions