This task is about identifying the effect of indicators on acid, alkali and neutral substances.
Part A: News from hues
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1. | Put a drop of red cabbage indicator solution in each spot in the top row of a spotting tile. |
2. | Cut the red litmus paper into four pieces, place a piece in each spot of the middle row of the spotting tile. |
3. | Cut the blue litmus paper into four pieces, place a piece in each spot of the bottom row of the spotting tile. |
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4. | Add one drop of white vinegar to each spot in column 1. |
5. | Add one drop of baking soda solution to each spot in column 2. |
6. | Add one drop of water to each spot in column 3. |
7. | Add nothing to each spot in column 4. |
8. | Write your results in the circles above. |
Results
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a) |
Use coloured pencils to colour in the spots on the table above to show the colour changes that have occurred.
NOTE: white vinegar is an example of a weak acid, baking soda solution is a weak alkali, and water is a neutral solution.
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b) |
Complete these sentences
Acids make indicators go ______________________.
Alkalis make indicators go _______________________.
Neutral solutions have _______________________ on the colour of a substance. |
c) |
Why did one column of the spotting tile have nothing added to it?
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Part B: Acid, alkali or neutral
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a) |
Complete this table to show your results.
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b)
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Rank the substances you tested from the strongest acid to the strongest alkali.
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