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| Question | Answer |
| what 5 positive ions can be detected using flame tests? | lithium potassium barium calcium sodium |
| what colour does a lithium ion give? | crimson |
| what colour flame does barium give? | green |
| what colour does calcium give? | red |
| what substance gives a lilac flame? | potassium |
| what substance gives a yellow flame? | sodium |
| which 3 ions form coloured precipitates when sodium hydroxide is added? | iron 2, iron 3 and copper2 |
| what colour ion does iron 2 form? | green |
| what colour precipitate does iron 3 form? | brown |
| what colour precipitate does copper 2 form? | blue |
| what 3 ions form white precipitates? | aluminium calcium and magnesium |
| how do you differentiate between the 3 ions that form a white precipitate with sodium hydroxide | magnesium does naff all calcium is red on flame test aluminium dissolves in the excess sodium hydroxide solution |
| how do you differentiate between the 3 ions that form a white precipitate with sodium hydroxide | magnesium does naff all calcium is red on flame test aluminium dissolves in the excess sodium hydroxide solution |
| how do you test for a carbonate ion? | react it with a dilute acid and it will form co2, test this because it turns limewater cloudy |
| how do you test for a halide ion? | - add dilute nitric acid to the compound -then add silver nitrate solution |
| if a halide made a WHITE precipitate when reacted with silver nitrate solution and dilute nitric acid, which halide would it be? | chloride because silver chloride is white |
| if a halide made a PALE YELLOW precipitate when reacted with silver nitrate solution and dilute nitric acid, which halide would it be? | iodide because silver iodide is yellow |
| silver bromide is what colour? | cream |
| how do you identify sulfate ions? | they produce a white precipitate with barium chloride in the presence of dilute hydrochloric acid |
| what is a suitable indicator for titration experiments? | phenophthalein |
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