pH Calculations for Polyprotic Acids

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Calculating pH for polyprotic acids like phosphoric acid, H3PO4 and sulfurous acid, H2SO3 ... where all Ka values are small. This does NOT apply to calculation pH for sulfuric acid, H2SO4.
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Great video! I've always found it faster to just set up a quadratic and solve for x and then you get an exact solution.

thephonecollector