Laboratory pH meter

Laboratory pH meter

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Caption: A pH meter. This measures the concentration of hydrogen ions in an aqueous solution. A glass probe is dipped into the solution being tested. The presence of hydrogen ions changes the electrical potential between a test electrode and standard electrode within the probe - this difference is directly related to the pH (negative log of the concentration of hydrogen ions). The principal purpose is to show the acidity or alkalinity of a solution.

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Keywords: acid, acidity, alkali, alkalinity, analogue, analysis, aqueous, chemical, chemistry, dial, display, electrode, galvanic cell, glass, hydrogen ion concentration, laboratory, measurement, neutral, neutrality, number, numeric, ph meter, physical, probe, quantitative, quantity, school science, science education, solution, test, testing, water

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