C3, analysis and quantative chemistry 0.0 / 5 ? ChemistryAnalysing substancesGCSEAQA Created by: emmajane_Created on: 21-04-14 11:26 What does a a flame test identify? metal ions 1 of 16 What is step 1 of the flame test? Dip clean loop in same sample solution 2 of 16 What is step 2 of the flame test? Hold flame test loop at edge of bunsen burner flame 3 of 16 What is step 3 of the flame test? Observe changed colour of flame and decide which metal it indicates 4 of 16 What is step 4 of the flame test? Clean loop in acid and rinse with water. Repeate steps 1-3 with a new sample 5 of 16 What colour are the metal ions flame colour?: Lithium, sodium, calcium and barium? L= crimson S= Yellow P=Lilac C=Red B= Green 6 of 16 What is a precipitate? An insoluble solid formed from reactions 7 of 16 What colour precipitate do calcium, magnesium and aluminium form when reacted with sodium hydroxide? A white precipitate 8 of 16 Name the colour of the precipitate from these metals: Copper (II) Iron (II) Iron (III) C= Blue I(II)= Green I(III)= Brown 9 of 16 What is step 1 of testing for carbonate atoms? Carbonat acids react with dilute acids to producce carbon dioxide and water 10 of 16 What is step 2 of testing for carbonate atoms? Collect gas given off and bubble it through limewater. Turns cloudy white if carbonate atoms are present. White precipitate is formed 11 of 16 What is step 1 of testing for sulphate ions? Add a few drops of dilute hydralic acid to solution 12 of 16 What is step 3 of testing for sulphate ions? Add a few drops of barium chlride to solution 13 of 16 Why can't universal indicator be used for titrations? Because it comes in a range of colours 14 of 16 What should be used instead of universal indicator for titrations and why? Phendphthalein because it turns pink if there's an alkaili present and colourless if acid is present 15 of 16 What is the purpose of titrations? To determine the amount of acid and alkali needed to neutralise a substance/mixture 16 of 16
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