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    Introduction to pH

    pH is the measure for the concentration of the hydrogen ion. This is chemically defined as the negative decimal logarithm of the hydrogen ion activity in a solution. Pure (neutral) water has a hydrogen ion activity of 10-7 at 25oC, which corresponds to a pH of 7.

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    The pH Test

    Many analytical methods and tests are often influenced by the pH which is where it is of more practical importance than just determining the concentration of other ions. pH can be measured using pH indicator papers and strips.

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    Factors influencing pH

    pH indicators can be regarded as weak acids or bases therefore the degree of dissociation can be influenced by co-solvents such as salts, proteins, colloids and organic solvents. Temperature is also a key factor which can influence pH and must be considered when conducting any testing.

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Our staff ensure that all products are formulated and calibrated to meet established standards.

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Company Background

Johnson Test Papers has been manufacturing easy to use rapid tests since 1938 providing fast and accurate resultsyou can trust.

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