ESAT Chemical Tests (C16)
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Flashcards testing ESAT (Engineering Science Admissions Test) Chemistry chemical tests, chapter C16
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20 Terms
Hydrogen
burning splint held at the open end of a test tube, makes a ‘squeaky pop’
Oxygen
relights a glowing splint
Carbon dioxide
limewater turns milky when shaken with gas
Chlorine gas
damp blue litmus paper turns red and then is bleached (turns white)
Carbonates
dilute acid make carbon dioxide (then limewater)
Halide ions
silver nitrate make different coloured precipitates (Cl2 = white, Br2 = cream, I2 = yellow) in the presence of dilute nitric acid
Chloride ions
first use nitric acid to remove carbonates (white silver carbonate = false positive), then silver nitrate to make white precipitate
Sulfates
aqueous barium chloride makes insoluble white precipitate in the presence of dilute hydrogen chloride
Al3+
aqueous sodium hydroxide makes white precipitate
Ca2+
aqueous sodium hydroxide makes white precipitate
Mg2+
aqueous sodium hydroxide makes white precipitate
Cu2+
aqueous sodium hydroxide makes blue precipitate
Fe2+
aqueous sodium hydroxide makes green precipitate
Fe3+
aqueous sodium hydroxide makes brown precipitate
Li flame test
crimson red
Na flame test
yellow-orange
K flame test
lilac
Ca flame test
red-orange
Cu flame test
green
Water
anhydrous copper(II) sulfate from white to blue
Note 
Flashcards (41)