plumiTests for ions: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 8.B.5 Tests for ions, 2019–2025, with mark schemes and examiner’s reports where available.
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Q2(a)(iii)
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All 41 questions on Tests for ions, as a list
- June 2025, AS Unit 3, Q2(a)(iii) (2 marks): Both lithium ions and strontium ions produce red flame colours, so further tests are required to identify these cations. Explain how a chemical test could be us
- June 2025, Unit 6, Q1(b)(i) (3 marks): Write ionic equations to account for the following observations. State symbols are not required. (3) Formation of green precipitate in Test 1 Formation of gas t
- January 2025, AS Unit 3, Q1(a)(ii) (2 marks): The student dissolved some of the solid sample in deionised water in a test tube. To the test tube, the student added dilute hydrochloric acid followed by aqueo
- January 2025, AS Unit 3, Q1(b)(i) (2 marks): The student warmed some of the solution in a test tube, before adding aqueous sodium hydroxide and holding damp red litmus paper at the mouth of the tube. + . F
- January 2025, AS Unit 3, Q1(b)(ii) (3 marks): To another test tube of the solution, the student added silver nitrate solution. A pale yellow precipitate was observed. The student then added an excess of dil
- June 2024, AS Unit 2, Q10 (1 mark): Which solution remains clear on addition to barium chloride solution? A dilute sulfuric acid B silver nitrate solution C sodium nitrate solution D sodium sulfat
- June 2024, Unit 6, Q5(a)(i) (2 marks): Describe how to carry out Step 4. You should identify both how to perform the test and how you would know all the ammonia had been evolved. (2)
- June 2024 (R), AS Unit 3, Q2(b)(iii) (2 marks): It is suspected that a bottle of magnesium chloride solution has been contaminated with barium chloride. Describe a test and its result, other than a flame test
- January 2024, AS Unit 2, Q9 (1 mark): Which test reagent could be used to identify an aqueous solution containing hydrogencarbonate ions, HCO– 3 ? A sodium carbonate B sodium hydroxide C nitric acid
- January 2024, Unit 6, Q1(c) (1 mark): The student tested for the anion in C by adding acidified barium nitrate solution and observed a white precipitate. Give the formula of the compound in solution
- October 2023, AS Unit 2, Q20(a)(i) (2 marks): Carbonate ions may be identified by their reaction with aqueous acid to produce carbon dioxide. Give the ionic equation for this reaction. Include state symbols
- October 2023, AS Unit 2, Q20(a)(ii) (1 mark): Limewater (an aqueous solution of calcium hydroxide) can be used to test for the presence of gaseous carbon dioxide. State what would be seen when carbon dioxid
- June 2023, AS Unit 3, Q1(b)(i) (2 marks): Give a test, with the expected result, to confirm the presence of the ammonium ion in B. (2) Test Expected result
- June 2023, AS Unit 3, Q1(b)(ii) (3 marks): Give a test, with the expected result, to confirm the presence of the sulfate ion in B. (3) Test Expected result
- June 2023, AS Unit 3, Q1(b)(iii) (1 mark): Write the ionic equation for the reaction taking place in (b)(ii). Include state symbols. (1)
- June 2023, Unit 6, Q1(c)(ii) (2 marks): Describe a test, and its positive result, that the student could have carried out to show the presence of sulfate ions. (2)
- October 2022, AS Unit 1, Q14(b)(iii) (1 mark): The barium chloride solution is acidified to prevent carbonate ions giving a false positive result. Write the ionic equation for the reaction of hydrochloric ac
- October 2022, AS Unit 3, Q1(a)(i) (1 mark): Give a reason why the mixture needs to be acidified. (1)
- October 2022, AS Unit 3, Q1(a)(ii) (2 marks): Identify, by name or formula, a suitable acid. Justify your answer. (2)
- October 2022, AS Unit 3, Q1(a)(iii) (2 marks): A student is given a sample of white crystals to test for sulfate ions. Describe how the test should be carried out, including the positive result. (2)
- October 2022, Unit 6, Q1(a)(ii) (1 mark): Add acidified A white precipitate forms X is barium chloride solution
- June 2022, AS Unit 2, Q7 (1 mark): The presence of ammonium ions in a compound can be shown by adding a reagent, warming the mixture and testing the gas evolved. What is the reagent and the resul
- June 2022, Unit 6, Q1(b)(i) (1 mark): Identify, by name or formula, the gas given off when B is warmed with aqueous sodium hydroxide. (1)
- January 2022, AS Unit 2, Q17 (1 mark): Four tests used to identify ions are shown: 1 flame test 2 addition of acidified barium nitrate solution 3 addition of acidified silver nitrate solution 4 addit
- January 2022, AS Unit 3, Q1(a)(ii) (2 marks): Describe a test to confirm the presence of NH 4 + ions in a solution of NH4Cl. Include the result of the positive test. (2)
- October 2021, Unit 6, Q1(b) (2 marks): Describe a test, and its positive result, to confirm the presence of the sulfate ion in another sample of the copper(II) sulfate solution. (2)
- June 2021, AS Unit 3, Q1(b) (4 marks): Sodium sulfate and potassium carbonate may also be distinguished using chemical tests. Give a chemical test for each compound which would confirm the identity o
- June 2021, Unit 6, Q1(b)(iv) (2 marks): When the mixture from (b)(iii) is warmed, a gas is evolved. Give a test to identify the gas stating the positive result of the test. (2)
- January 2021, AS Unit 2, Q9 (1 mark): Which of these compounds does not produce a colour in a flame test, and produces an alkaline gas when warmed with sodium hydroxide solution? A Ca(OH)2 B Mg(OH)2
- January 2021, AS Unit 2, Q21(a) (2 marks): A test to confirm the presence of an aqueous acid is adding a small amount of solid sodium carbonate to the solution. Describe two observations you would see in
- January 2021, AS Unit 3, Q1(a)(ii) (1 mark): The student mixed 1 cm3 of solution A separately with 1 cm3 of each of the other solutions. There was no change for three of the mixtures but effervescence was
- January 2021, Unit 6, Q1(b)(ii) (1 mark): When A is added to C, vigorous effervescence occurs and the gas produced turns limewater cloudy. Identify, by name or formula, the gas produced. (1)
- January 2021, Unit 6, Q1(b)(iii) (1 mark): Suggest the identity, by name or formula, of the anion in C. (1)
- January 2021, Unit 6, Q1(b)(iv) (2 marks): Identify A by name or formula. Justify your answer. (2)
- January 2021, Unit 6, Q1(b)(v) (2 marks): When A is added to D no change is seen. A small amount of this mixture is added to B and a white precipitate forms. Suggest what can be deduced about solutions
- October 2020, AS Unit 2, Q14(a) (2 marks): Write the equation for the formation of the white precipitate in this test. Include state symbols. (2)
- January 2020, AS Unit 3, Q1(b)(i) (2 marks): Barium chloride solution and hydrochloric acid were added to separate aqueous solutions of ammonium sulfate and ammonium nitrate. State what would be seen for e
- January 2020, AS Unit 3, Q1(b)(ii) (2 marks): Give a test, with the expected result, to confirm the presence of the +) in the ammonium compounds. ammonium ion (NH4 (2) Test Result
- June 2019, AS Unit 3, Q1(b) (6 marks): Complete the table, giving a chemical test, not involving indicators, and its result for each of the products of the decomposition of ammonium carbonate. (6) Pr
- June 2019, AS Unit 3, Q1(d)(i) (2 marks): About 1 cm3 of barium chloride solution was added to 5 cm3 of the ammonium carbonate solution (2)
- June 2019, AS Unit 3, Q1(d)(ii) (2 marks): About 5 cm3 of hydrochloric acid was added to the mixture from (i) (2)
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