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Contributed by: New York State Education Department (NYSED)
Task: At this station, you will experiment to determine
which of three solutions is acidic and which is basic.
Materials:
- Solution filled dropper bottles labeled A, B, and C
- Dropper bottle with phenolphthalein
- Blue litmus paper
- Red litmus paper
- Reaction transparency or plate
- Waste cup
- Paper towels
- Safety goggles
- Water for cleaning
Background:
Phenolphthalein turns pink in a basic solution.
Blue litmus paper turns red (pink) when dipped
in an acidic solution.
Red litmus paper turns blue (purple) when dipped
in a basic solution. |
Directions:
- Put your safety goggles on.
- Think carefully about an experiment you could do to determine
which of the three solutions is acidic and which is basic.
- In the space below, describe the procedures you will follow
in conducting your experiment.
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- CARRY OUT YOUR EXPERIMENT.
- Record your color observations in the data table below.
| Indicator |
Solution A |
Solution B |
Solution C |
| Blue Litmus |
|
|
|
| Red Litmus |
|
|
|
| Phenolphthalein |
|
|
|
- Wash the reaction plate or transparency with water. Throw away
any garbage into the waste cup.
- Using the data you have collected and the background information,
which solution is acidic?
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In the space below, explain the reason for your answer.
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- Using the data you have collected and the background information,
which solution is basic?
__________________________________________________________________________
In the space below, explain the reason for your answer.
__________________________________________________________________________
__________________________________________________________________________
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