Positive and Negative Ions and Precipitates A quick quiz based on ion testing and precipitates 4.5 / 5 based on 7 ratings ? ChemistryTesting and analysing substancesGCSEAQA Created by: H@S@NCreated on: 19-05-13 19:31 What is the loop used in flame tests made from? Nichrome 1 of 14 What metal ion produces a Crimson flame? Lithium 2 of 14 Which metal ion produces a green flame? Barium 3 of 14 Which metal ion produces a yellow flame? Sodium 4 of 14 When Sodium Hydroxide is added , which metal ion turns blue? Copper 5 of 14 Why is Iron (II) different to Iron (III) when sodium hydroxide is added? Iron (II) turns green whereas iron (III) turns browny-red 6 of 14 How do you find Aluminium ion? You add excess Sodium hydroxide , which turns Al ions colourless 7 of 14 If you add excess Sodium Hydroxide and there is a white precipitate, what positive ions could there be? Either Magnesium or Calcium ions 8 of 14 How is Negative ion testing different to Positive ion testing? Negative ions are non-metals unlike positive ions 9 of 14 How do you test for Carbonate ions? You pour in Hydrochloric Acid , and if a fizzing is heard there are Carbonate ions, as Carbon Dioxide is released. 10 of 14 What is needed to test for Halide ions? Nitric Acid and Silver Nitrate 11 of 14 What halide is present in a CREAM precipitate? Silver bromide is formed 12 of 14 What halide is present is a YELLOW precipitate? Silver Iodide is formed 13 of 14 What is added to test for Sulphate ions? Hydrochloric Acid and Barium Chloride is added 14 of 14
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