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The most common method is to use something called litmus paper, which comes in both red and blue.

When you dip the red litmus paper in the substance, if it turns blue, then the substance is a base.

When you dip the blue litmus paper in the substance, if it turns red, then the substance is an acid.

However, this doesn't give you the exact pH of the substance, so there are several other devices that you can buy that measure pH.

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14y ago

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