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You can tell by testing it with either universal indicator solution or with litmus paper.

There are other methods, but some of them are not exactly safe: acids usually taste sour (do not try this) and bases usually taste bitter (do not try this either). Also, bases tend to feel "slippery" (at the risk of sounding like a broken record, do not try this).

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7y ago
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15y ago

PH level.

A base will be neutral 7

Acid will be below that

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Q: How can you tell an acid from a base?
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