The pH scale is only valid for water. Explain.

Chemistry: Matter and Change
1st Edition
ISBN:9780078746376
Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
Publisher:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
Chapter18: Acids And Bases
Section: Chapter Questions
Problem 123A
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The pH scale is only valid for water. Explain.

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pH scale is only valid for water.

Water is made up of equal number of Hand OHions.

H+ OH-------> H2O

As pH is actually a measure of relative amount of free hydrogen and hydroxyl ions in the water. Water that has more free Hions is acidic, whereas water that has more free OHions is basic.

Water with equal number of Hand OH- ions is neutral.

The pH of water is affected by chemicals present in water. It is an important indicator of chemical change in water.

Chemically, pH = -log [H+]

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