CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY
Electrometrical measurement of the pH of a solution of methanoic acid. The pH of a solution is a measure of the amount of free hydrogen ions present. This indicates acidity and alkalinity. The more free ions present, the more acidic the solution is said to be. Here, the pH meter is showing 2.66, indicating quite a strong acid. The scale runs from 0-14, with pure water considered neutral at pH 7. Methanoic acid (formerly called formic acid) is a simple organic acid, and is present in ant bites.
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