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Making our own pH indicators

Making our own pH indicators . We often think of pH indicators as chemicals that can only be bought from chemical suppliers In fact, there are natural pH indicators all around us , if we know where to look. Same flowers.. different pH.

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Making our own pH indicators

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  1. Making our own pH indicators

  2. We often think of pH indicators as chemicals that can only be bought from chemical suppliers • In fact, there are natural pH indicators all around us , if we know where to look

  3. Same flowers.. different pH Can you guess which flowers have been grown in alkaline soil and which have been grown in acidic soil?

  4. copy Making Our Own Indicator

  5. Indicator from red cabbage • Take some chopped red cabbage and put it into a mortar and pestle • Add 10ml of water (use a measuring cylinder) • Grind up the cabbage Cabbage 10ml of water Mortar and pestle

  6. Filter the cabbage juice

  7. alkali acid • Divide the filtered juice evenly between 2 small beakers • Add a small drop of acid to one … • And a small drop of alkali to the other • Note the results in your table

  8. ethanol Indicator from flowers • Take some flower petals and put them into a mortar and pestle • Add a small amount of alcohol • Grind flower petals • Pour the juice through a strainer Petals ethanol Tea strainer Mortar and pestle

  9. alkali acid • Divide the strained juice evenly between 2 small beakers • Add a small drop of acid to one … • And a small drop of alkali to the other • Note the results in your table

  10. If there is time , repeat the process with different petals or vegetables • Which juice do you think makes the best indicator? • Why do you think this ?

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