Using a pH meter

Using a pH meter

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Credit: ANDREW LAMBERT PHOTOGRAPHY/SCIENCE PHOTO LIBRARY

Caption: MODEL RELEASED. Using a pH meter. Schoolgirl using a pH meter on a solution of dilute ethanoic acid (CH3.COOH). The display shows an acidic pH of 4.90. A pH reading measures the concentration of free hydrogen ions. A pH below 7 (acidic) is a higher concentration of hydrogen ions than found in water (pH 7, neutral). A pH above 7 (alkaline) is a lower concentration than found in water.

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