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Red Cabbage Indicator

Red Cabbage Indicator. Year 7 Science. Learning objectives. Identify the pH of substances from the colour obtained using Universal Indicator Distinguish between acids and alkalis using Litmus paper Produce an indicator solution from red cabbage and add a variety of common acids and alkalis.

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Red Cabbage Indicator

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  1. Red Cabbage Indicator Year 7 Science

  2. Learning objectives • Identify the pH of substances from the colour obtained using Universal Indicator • Distinguish between acids and alkalis using Litmus paper • Produce an indicator solution from red cabbage and add a variety of common acids and alkalis

  3. Common indicators Universal indicator Litmus paper

  4. Grind some red cabbage with hot water Wear goggles!

  5. Transfer 5ml of cabbage indicator to 5 tubes using a syringe Wear goggles!

  6. Add the acids and alkalis to the cabbage indicator Wear goggles! Hydrochloric acid Vinegar Water Sodium bicarbonate Sodium hydroxide Strong acid Weak acid Neutral Weak alkali Strong alkali

  7. Draw the test tubes and colour Wear goggles! Hydrochloric acid Vinegar Water Sodium bicarbonate Sodium hydroxide Strong acid Weak acid Neutral Weak alkali Strong alkali

  8. Draw the test tubes and colour Wear goggles! Hydrochloric acid Vinegar Water Sodium bicarbonate Sodium hydroxide Strong acid Weak acid Neutral Weak alkali Strong alkali

  9. Quick Quiz! 1. What colour does litmus paper go when placed in acids?

  10. Quick Quiz! 2. What colour do you expect the Universal indicator to turn?

  11. Quick Quiz! 3. What colour do you expect the Universal indicator to turn?

  12. Quick Quiz! 4. Lemon juice is a weak acid. Suggest its pH

  13. Quick Quiz! 5. Water is neutral. Suggest its pH

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