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When referring to acidity of a solution one uses the pH scale. The lower the number, the higher the acidity. Pure water is said to be neutral, and is a 7 on the scale. Anything with a lower number ranking is acidic, and anything with a higher ranking is basic.

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14y ago
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12y ago

The pH scale, between 0 and 14.

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Q: What scale is used to determine whether a solution is an acid or base?
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