The calculation of pH |
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| Authors: | Allan J. Macleod |
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| Affiliation: | Department of Management Studies , Scottish College of Textiles , Galashiels, Scotland |
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| Abstract: | A model for the pH of a mixture of a monoprotic acid and its associated salt leads to a cubic equation. This equation is shown to have real roots — one positive and two negative. The exact theory for cubic equations provides a simple expression for the positive root. Due to rounding errors the use of this formula can give poor results, so the use of Newton‐Raphson is considered. |
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