Testing for Cations, Anions and Gases 0.0 / 5 ? ChemistryTesting and analysing substancesIGCSEEdexcel Created by: freya.willsCreated on: 08-05-16 12:01 How do you test for Cl- and what happens? Dilute nitric acid and silver nitrate solution. Forms a white precipitate 1 of 19 How do you test for I- and what happens? Dilute nitric acid and silver nitrate solution. Forms a yellow precipitate 2 of 19 How do you test for Br- and what happens? Dilute nitric acid and silver nitrate solution. Forms a cream precipitate 3 of 19 How do you test for SO4 2- and what happens? Dilute hydrochloric acid and barium chloride solution. Forms a white precipitate 4 of 19 How do you test for CO3 2- and what happens? Dilute hydrochloric acid. CO2 will be produced, test using limewater 5 of 19 Test for hydrogen? A squeaky pop if placed by a lit splint 6 of 19 Test for oxygen? Relights a glowing splint 7 of 19 Test for carbon dioxide? Turns limewater cloudy 8 of 19 Test for ammonia? Turns damp red litmus paper blue 9 of 19 Test for chlorine? Bleaches damp litmus white, may first turn red due to the acidity of chlorine 10 of 19 How do you do a flame test? Dip a platinum wire into dilute HCl and hold in the flame. Then dip the wire into the sample being tested 11 of 19 How do you test for Li+ and what happens? A flame test. Produces a Red flame 12 of 19 How do you test for Na+ and what happens? A flame test. Produces a persistent orange flame 13 of 19 How do you test for K+ and what happens? A flame test. Produces a lilac flame 14 of 19 How do you test for Ca 2+ and what happens? A flame test. Produces a brick red flame 15 of 19 How do you test for NH4 + and what happens? Using sodium hydroxide solution. Ammonia gas will be produced which can be tested for using litmus paper 16 of 19 How do you test for Cu 2+ and what happens? Using sodium hydroxide solution. Forms a blue precipitate 17 of 19 How do you test for Fe 2+ and what happens? Using sodium hydroxide solution. Forms a sludgy green precipitate 18 of 19 How do you test for Fe 3+ and what happens? Using sodium hydroxide solution. Forms an orange-brown precipitate 19 of 19
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