Tests for Ions Revision 0.0 / 5 ? ChemistryTests for IonsA2/A-levelOCR Created by: ElishaGCreated on: 18-02-17 19:12 What is an acid? A proton donor (releases H+ ions in solution). 1 of 14 What is the test for H+ ions? 1)Add blue litmus paper to sample. 2)Blue litmus paper turns red. 2 of 14 What is an alkali? A soluble base that releases OH- ions in a solution. 3 of 14 What is the test for hydroxide ions? 1)Add red litmus paper to sample. 2)Red litmus paper turns blue. 4 of 14 Describe the test for a carbonate ion. 1)Add a dilute aqueous acid, e.g. HCl. 2)CO2 is released, which causes effervescence. 5 of 14 What is the test for sulfate ions? 1)Add barium chloride solution. 2)White precipitate forms. 6 of 14 What is the test for halide ions? 1)Add aqueous silver nitrate. 2)White/cream/yellow precipitate forms.3)Precipitate remains/ dissolves when dilute and concentrated ammonia is added. 7 of 14 What colour precipitate does chlorine form? White. 8 of 14 What colour precipitate does bromine form? Cream. 9 of 14 What colour precipitate does Iodine from? Yellow. 10 of 14 What is the solubility of AgCl in dilute and concentrated ammonia? Dilute- Soluble. Concentrated- Soluble. 11 of 14 What is the solubility of AgBr in dilute and concentrated ammonia? Dilute- Insoluble. Concentrated- Soluble. 12 of 14 What is the solubility of AgI in dilute and concentrated ammonia? Dilute-Insoluble. Concentrated- Insoluble. 13 of 14 What is the test for an ammonium ion? 1)Add sodium hydroxide solution and warm.2) Ammonia gas is evolved which turns red litmus paper blue. 14 of 14
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