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Reactions of ions in aqueous solution (A-level only)
This A-level-only topic extends test-tube chemistry to identify aqueous ions.
5
Objectives
10
Flashcards
10
Questions
90 min
Study time
AqaA LevelChemistryInorganic chemistry
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Syllabus checklist
What you need to know
5 objective pages available
Aqueous ion tests (A-level only)5 objectives
- Describe reactions of aqueous metal ions with sodium hydroxide.
- Describe reactions of aqueous metal ions with ammonia.
- Identify carbonate, sulfate and halide ions using appropriate tests.
- Link observations to conclusions in qualitative analysis.
- Required practical: carry out test-tube reactions to identify cations and anions.
Key terms
PrecipitateAqueousTetraamminecopper(II)Hexammine nickel(II)EffervescenceQualitative analysisAqueous solution
Exam tips
- Pay attention to observations: Clearly describe the color changes and precipitate formations during reactions.
- Memorize complex ion colors: Familiarize yourself with the colors of common metal-ammonia complexes.
Common mistakes
- Incorrectly balancing equations: Always check that the number of atoms for each element is the same on both sides of the equation.
- Confusing precipitate colors: Remember that iron(III) hydroxide is reddish-brown, while copper(II) hydroxide is blue.
Practice preview
- What is the observation when aqueous copper(II) ions react with sodium hydroxide?
- Write the balanced equation for the reaction of aqueous iron(III) ions with sodium hydroxide.
- If 0.1 mol of zinc sulfate is reacted with an excess of sodium hydroxide, what is the mass of zinc hydroxide precipitate formed?
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