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It indicates the concentration of H+ ions in an aqueous solution.

It measures the acidity or alkalinity of a liquid. A pH of 7 (green with universal indicator) denotes Neutral. Anything below that is acidic, and anything above it is alkaline or basic.

For everyday use, the pH scale goes from 1 (red) to 14 (purple).

*The pH scale measures the concentration of H+ ions (or the acidity/alkalinity) in a solution. It is found by log-1 [H+], and ranges on a scale from 1 to 14 with 1 being the most acidic solution, 14 being the most basic solution, and 7 being neutral.

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The pH scale is used to measure the amount of what atom?

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