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Understanding Litmus and pH Indicators in Chemistry

In today's lesson, we will explore the role of litmus as a pH indicator, which changes color in acids and alkalis. Litmus turns red in acidic solutions and blue in alkaline ones, allowing us to identify these substances, though it doesn't indicate their strength. We will also investigate alternative indicators and how they can be made from different substances. Gather around for an engaging session with Mr. Porter, and remember to prepare for the upcoming test on digestion this Friday!

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Understanding Litmus and pH Indicators in Chemistry

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Presentation Transcript

  1. Can you spell the following words CORRECTLY in your book? Newtralisation, asid, alcali, litmas, indicater. Do now!

  2. Last lesson • Using Litmus as an indicator

  3. Indicators Indicators are chemicals (coloured dyes) which change colour in acids and alkalis.

  4. Litmus Turns red in acid Turns blue in alkali

  5. Litmus Turns red in acid Turns blue in alkali Litmus can tell us if something is an acid or an alkali, but it cannot tell us how strong the acid or alkali is

  6. Other indicators We are going to investigate today whether other substances can be used as indicators

  7. Making an Indicator

  8. Can you quickly, quietly and sensibly gather around Mr Porter? (You’ll need your stools)

  9. Test! Don’t forget you have a test Friday on Digestion (8A)!

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