analysing substances

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gcse chemistry Flashcards on analysing substances, created by Ella Wolf on 19/05/2013.
Ella Wolf
Flashcards by Ella Wolf, updated more than 1 year ago
Ella Wolf
Created by Ella Wolf almost 11 years ago
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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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