Indicators in acid-based titrations 0.0 / 5 ? ChemistryTitrationsASAQA Created by: hannah fozardCreated on: 21-04-16 16:05 When should Phenolphthalein be used as an indicator? When you have a strong acid-strong base OR a weak acid- strong base 1 of 6 When should methyl orange be used as an indicator? When you have a strong acid-strong base OR a strong acid-weak base 2 of 6 Colour changes of pheolphthalein Colourless in acidic and neutral solutions / PINK in alkaline solutions 3 of 6 Colour changes of methyl orange RED in acidic solutions / ORANGE in neutral solutions / YELLOW in alkaline solutions 4 of 6 Adding an alkali to an acid Methyl orange - red to yellow Phenolphthalein - colourless to pink 5 of 6 Adding an acid to an alkali Methyl orange - yellow to red Pheonlphthalein - pink to colourless 6 of 6
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