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USING A pH METER WITH BROMOTHYMOL BLUE INDICATOR
(1 of 3 - Variations Available).
Pure Water At 298K Has a Neutral pH of 7
pH, used to express degree of acidity, is an index of hydrogen's chemical activity in a solution. At pH 7 the acid ( H3O+) and base (OH) concentrations are equal & the solution, water, is neutral, the indicator is green.
Copyright:© 2005 Richard Megna - Fundamental Photographs
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