Tests for Negative Ions — GCSE Chemistry Revision
Revise Tests for Negative Ions for GCSE Chemistry. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP.
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Go to Flame TestsWhat is Tests for Negative Ions?
Negative ions (anions) can also be identified using specific chemical tests. These tests often involve the formation of a precipitate or the production of a gas. For example, carbonate ions are tested for using acid, while halide ions are tested for using silver nitrate.
Board notes: The tests for carbonate, sulfate, and halide ions are required knowledge for all exam boards. You must know the reagents, conditions, and expected results for each test.
Step-by-step explanationWorked example
To test for chloride ions (Cl⁻) in a solution, first add a few drops of dilute nitric acid, then add a few drops of silver nitrate solution. If chloride ions are present, a white precipitate of silver chloride (AgCl) will form.
Mini lesson for Tests for Negative Ions
1. Understand the core idea
Negative ions (anions) can also be identified using specific chemical tests. These tests often involve the formation of a precipitate or the production of a gas.
Can you explain Tests for Negative Ions without copying the notes?
2. Turn it into marks
To test for chloride ions (Cl⁻) in a solution, first add a few drops of dilute nitric acid, then add a few drops of silver nitrate solution. If chloride ions are present, a white precipitate of silver chloride (AgCl) will form.
Underline the method, evidence, or command-word move that would earn credit in GCSE Chemical Analysis.
3. Fix the likely mark leak
Watch for this mistake: Forgetting to add nitric acid before testing for halide ions. This is essential to remove any carbonate ions that might also form a precipitate with silver nitrate, giving a false positive result.
Write one correction rule before doing another practice question.
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Tests for Negative Ions practice questions
These are original StudyVector questions for revision practice. They are not official exam-board questions.
Question 1
In one GCSE sentence, explain what Tests for Negative Ions is testing.
Answer: Negative ions (anions) can also be identified using specific chemical tests. These tests often involve the formation of a precipitate or the production of a gas.
Mark focus: Precise definition and topic focus.
Question 2
A Tests for Negative Ions question uses an unfamiliar context. What should the answer do before adding detail?
Answer: It should name the process, variable, equation, particle model, or evidence being tested, then explain the result using precise scientific vocabulary.
Mark focus: Method selection and command-word control.
Question 3
A student makes this mistake: "Forgetting to add nitric acid before testing for halide ions. This is essential to remove any carbonate ions that might also form a precipitate with silver nitrate, giving a false positive result." What should their next repair task be?
Answer: Do one Tests for Negative Ions question and review the mistake type.
Mark focus: Error correction and next-step practice.
Tests for Negative Ions flashcards
Core idea
What is the main idea in Tests for Negative Ions?
Negative ions (anions) can also be identified using specific chemical tests. These tests often involve the formation of a precipitate or the production of a gas.
Common mistake
What mistake should you avoid in Tests for Negative Ions?
Forgetting to add nitric acid before testing for halide ions. This is essential to remove any carbonate ions that might also form a precipitate with silver nitrate, giving a false positive result.
Practice
What is one useful practice task for Tests for Negative Ions?
Answer one Tests for Negative Ions question and review the mistake type.
Exam board
How should you use board notes for Tests for Negative Ions?
The tests for carbonate, sulfate, and halide ions are required knowledge for all exam boards. You must know the reagents, conditions, and expected results for each test.
Common mistakes
- 1Forgetting to add nitric acid before testing for halide ions. This is essential to remove any carbonate ions that might also form a precipitate with silver nitrate, giving a false positive result.
- 2Confusing the colours of the silver halide precipitates. Silver chloride is white, silver bromide is cream, and silver iodide is yellow.
- 3Mixing up the tests for sulfate and sulfite ions. Sulfate ions (SO₄²⁻) are tested for with barium chloride and hydrochloric acid, forming a white precipitate.
Tests for Negative Ions exam questions
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Tests for Negative Ions
Core concept
Negative ions (anions) can also be identified using specific chemical tests. These tests often involve the formation of a precipitate or the production of a gas. For example, carbonate ions are tested…
Frequently asked questions
Why is nitric acid used before the halide test?
Nitric acid is added to acidify the solution and react with any carbonate ions present. If carbonate ions were not removed, they would form a white precipitate of silver carbonate, which would interfere with the test for chloride ions.
How do you test for carbonate ions (CO₃²⁻)?
To test for carbonate ions, add a dilute acid (like hydrochloric acid). If carbonate ions are present, the mixture will fizz and produce carbon dioxide gas, which can be tested with limewater.