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The simplest way is to use litmus paper.

The mixture must be a liquid so that the mixture can react with the water and so dissociate into either hydronium or hydroxide ions. If it's a solid, try dissolving it in water. If you have a gas, use damp litmus paper.

Red litmus paper is used to test for basic substances, and turns blue in a positive test.

Blue litmus paper is used to test for acidic substances, and turns red in a positive test.

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12y ago

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