AQA GCSE Chemistry Chemical Analysis
- Created by: whysonari
- Created on: 25-09-18 19:36
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- Testing for Gases, Cations+ Anions.
- Cations
- Flame Tests - metal ion is put under blue flame the ions change the colour
- Cu2+ ions = green flame
- Li+ ions = crimson flame
- Na+ ions = yellow flame
- Ca2+ ions = orange red flame.
- K+ ions = lilac flame
- Precipitates-sodium hydroxide is added to a solution and a precipitate forms
- Calcium = white precipitate
- magnesium = white precipitate.
- Aluminium = white precipitate but redissolves with excess NaOH
- Copper(II) = blue precipitate
- Iron(II) = green precipitate.
- Iron(III) = brown precipitate.
- Flame Tests - metal ion is put under blue flame the ions change the colour
- Anions
- Halides Test - nitric acid + silver nitrate
- Fluoride = white precipitate
- chloride = cream precipitate
- bromide = yellow prepitate
- Testing for sulfates. dilute hydrochloric acid + barium chloride
- white precipitate = sulfate is present.
- Halides Test - nitric acid + silver nitrate
- Common Gases
- oxygen relights a glowing splint
- carbon dioxide turns limewater cloudy.
- Chlorine bleachs DAMP litmus paper.
- hydrogen - lit splint is held under it makes a squeaky pop
- Cations
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