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Is it Acid or Alkali?

Is it Acid or Alkali?. Using an indicator. What is an indicator?. A simple indicator just tells us whether we have an acid or an alkali e.g. ……………. …………… Litmus paper. It goes in acids. RED. and in alkalis. BLUE.

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Is it Acid or Alkali?

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  1. Is it Acid or Alkali? Using an indicator

  2. What is an indicator? A simple indicator just tells us whether we have an acid or an alkali e.g. …………… …………… Litmus paper It goes in acids RED and in alkalis BLUE

  3. But how strong is the acid or alkali? For this we use Universal indicator What do the numbers mean? This has a range of colours depending on the strength of the acid or alkali

  4. pH and what it means pH ____ is neutral 7 pH ____ is a strong acid 1 pH ____ is a strong alkali 14

  5. Weak and Strong Copy and complete the following. Slightly alkaline will be pH___ Slightly acid will be pH___ If it turns blue it is a ……… If it turns orange it is a…..

  6. Aide Memoir small number Small word acid = = High number long word alkali = =

  7. Where do we get indicators from? Most are plant dyes e.g. litmus, red cabbage and beetroot. Universal indicator is a mixture of plant dyes so we get different colours according to the pH

  8. Where do we get indicators from? Try making your own at home

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