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Chemistry student measuring pH

Chemistry student measuring pH

H460/0243

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Credit

ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY

Caption

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. 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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