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Indicator Test Tubes
Age 14 · Chemistry
The pH scale runs from 0 to 14. Universal indicator turns red in acids, green at neutral, and violet in alkalis.
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In the picture
- Leftmost tube: red liquid, strongly acidic, about pH 1
- Second tube: yellow liquid, weakly acidic, about pH 5
- Middle tube: green liquid, neutral, pH 7
- Fourth tube: blue liquid, weakly alkaline, about pH 9
- Rightmost tube: deep violet liquid, strongly alkaline, about pH 13
Examples
- Lemon juice is acidic.
- Baking soda solution is alkaline.
Key takeaways
- pH below 7 is acidic; pH above 7 is alkaline.
- pH 7 is neutral.
Quiz: Indicator Test Tubes (Age 14)
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On the pH scale, what is a solution with a pH below 7 called?
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What pH value is neutral?
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What colour does universal indicator turn in a neutral solution?
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