16.3 The pH Scale and pH Calculations | General Chemistry

Chad provides chemistry lesson on the pH Scale for acids and bases and pH Calculations. First, the pH scale is introduced with a pH less than 7 corresponding to an acidic solution, a pH above 7 a basic solution, and a pH equal to 7 a neutral solution. The logarithmic nature of the pH scale is also described as each pH unit difference corresponds to a 10-fold difference in the H+ and OH- concentrations. The pH formula and pOH formula are then defined (pH = -log [H+]; pOH = -log[OH-]) and several examples of how to calculate of pH, pOH, [H+], and [OH-] are performed. Their relationships are demonstrated with several example calculations, and it is made evident how when provided any 1 of the 4 values, the other 3 can be calculated.

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00:00 Lesson Introduction
00:26 Autoionization of Water. Kw, and the pH Scale
04:48 pH Formula and pOH Formula
08:23 The pH Scale
13:41 How to Calculate pH, pOH, [H+], [OH-]

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