ph levels

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Title: ph levels

Essay Details:

Subject: Science

Author: Judy A

Date: January 1, 2016

Level: University

Grade: A

Length: 2 / 509

Essay text:

A better definition would be pH=-log[aH1+ ], where aH1+ denotes the activity of the H1+ ion. The activity of an ion is a function of many variables of which concentration is one. It is unfortunate that chemistry texts use a definition for pH that has been obsolete for over 50 years. Because of the difficulty in accurately measuring the activity of the H1+ ion for most solutions the International Union of Pure and Applied Chemistry (IUPAC) and the National Bureau of Standards (NBS) has defined pH as the reading on a pH meter that has been standardized against standard buffers. The following equation is used to calculate the pH of all solutions: The activity of the H1+ ion is determined as accurately as possible for the standard solutions used...

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