C3 Chapter 4 Analysis and Synthesis 0.0 / 5 ? ChemistryAnalysing substancesGCSEAQA Created by: ColdAsteroidCreated on: 13-01-16 19:42 What are the two different ways of identifying positive ions? Flame tests and precipitation reactions 1 of 22 Describe the flame test for lithium ions. Gives a crimson flame. 2 of 22 Describe the flame test for sodium ions. Gives a yellow flame. 3 of 22 Describe the flame test for potassium ions. Gives a lilac flame. 4 of 22 Describe the flame test for calcium ions. Gives a red flame. 5 of 22 Describe the flame test for barium ions. Gives a green flame. 6 of 22 What is formed when specific ions are reacted with NaOH solution? Precipitates 7 of 22 What colour precipitate is formed when you add NaOH to calcium, magnesium or aluminium ions? White precipitates 8 of 22 What happens if you add excess NaOH to aluminium ions? It redissolves in the NaOH. 9 of 22 How do we find which one is which out of the magnesium or calcium ions? Perform flame test. Red flame=calcium. Other is magnesium 10 of 22 Describe the precipitation reaction of copper(II) ions. Blue precipitate is formed 11 of 22 Describe the precipitation reaction of iron(II) ions. Green precipitate is formed 12 of 22 Describe the precipitation reaction for iron(III) ions. Brown precipitate is formed 13 of 22 What are the steps finding out whether it's a carbonate ion? Add dilute acid. it reacts with carbonate to make CO2 gas 14 of 22 To make sure it's CO2, what do we do? Bubble through limewater and see if it turns cloudy.=> From CO3 15 of 22 What is the equation of acids and carbonates reacting? Acid+carbonate --> salt+water+carbon dioxide 16 of 22 What steps do we follow to find out whether it's a halide ion? Add dilute HNO3=>Add Silver nitrate solution. Precipitates formed. 17 of 22 If it's a chloride ion what colour precipitate is formed? White precipitate. 18 of 22 If it's a bromide ion what colour precipitate is formed? Cream precipitate. 19 of 22 If it's an iodide ion what colour precipitate is formed? Yellow precipitate. 20 of 22 What steps do we follow to find out whether it's a sulfate ion? Add dilute HCl or HNO3=>add barium chloride solution. 21 of 22 What is formed if it is a sulfate ion? A white precipitate. 22 of 22
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