GOB Chemistry

Learn the toughest concepts covered in your GOB - General, Organic, and Biological Chemistry class with step-by-step video tutorials and practice problems.

Acids and Bases

The pH Scale

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The pH and pOH of a compound helps to determine its acidity and basicity.

The pH Scale

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The pH Scale Concept 1

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pH stands for the negative logarithmic function of your hydronium concentration, whereas pOH stands for the negative logarithmic function of hydroxide concentration.

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The pH Scale Concept 2

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If we know the pH or pOH concentration then we can determine the concentration of hydronium ions or hydroxide ions.

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The pH Scale Concept 3

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If the pH is less than 7 then the solution is acidic, if the pH is equal to 7 then the solution is neutral and if the pH is greater than 7 then the solution is basic.

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The pH Scale Concept 4

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Under normal conditions when the concentration is less than 1.0 M the pH scale is between 0 to 14. pH and pOH are connected by the following equation:

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The pH Scale Example 1

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Problem

Which of the following statements about aqueous solutions is/are true?

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The pH Scale Example 2

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Problem

What is the Kw of pure water at 20.0°C, if the pH is 7.083?