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2.29
- Closer to 0, stronger acid is
- Closer to 14, stronger alkali is
- pH 7 > x > 0 - acid
- pH 14 > x > 7 - alkali
- pH 7 - neutral
2.30
- Dark red - very strong acid
- Red - strong acid
- Orange - medium acid
- Yellow - weak acid
- Light green - very weak acid
- Green - neutral
- Dark green - very weak alkali
- Very dark green - weak alkali
- Light blue - alkali
- Dark blue - strong alkali
- Navy - very strong alkali
2.28
- Litmus paper:
- Acid - red
- Alkali - blue
- Phenolphthalein:
- Acid - colourless
- Alkali - pink
- Methyl orange:
- Acid - red
- Alkali - yellow