The pH scale. Going from red to extremely acidic, all the way to the purple for alkalines, with green in the middle. However, can you tell me where some of these substances would go, but you have to give one of these five options:
Strong Acid
Weak Acid
Neutral
Weak Alkali
Strong Alkali
1. Acid Rain
2. Rain Water
3. Water
4. Sodium Hydroxide
5. Washing up Liquid
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