Chemistry student measuring pH

Chemistry student measuring pH

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Credit: ANDREW LAMBERT PHOTOGRAPHY/SCIENCE PHOTO LIBRARY

Caption: MODEL RELEASED. Pupil measuring pH. Schoolboy using a digital pH meter to measure the pH of dilute ethanoic (acetic) acid. The display shows 2.9, indicating that this is a moderately strong acid. pH is a measure of a solution's acidity or alkalinity. It runs from 1 (most acidic) to 14 (most alkaline). Water is considered neutral (pH 7). Ethanoic acid is found in vinegar.

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