Acid and Base Equations:

  1. An equation which can be used to calculate pKa from Ka

  2. Kw This equation can be used to calculate the concentration of protonated water or hydroxide ions

  3. This is the Henderson-Hesselbach equation. This equation can be used to calculate the initial pH of a buffer i.e a strong acid reacting with a weak base or a weak acid reacting with a strong base

  4. pH of weak acids or bases This equation can be used to calculate the pH of a weak acid or base

  5. This equation can be rearranged to calculate pH, pOH or pKwas long as two of the three variables are known

  6. Kb=base equivalent of pKaTherefore a large pKb signals a weak base small pKb is equal to a weak base pKb is calculated by using a reaction equation where the substance which is protonated is treated as the product ie goes on the bottom of the pKbequation strength of acid plus strength of alkali in an equation has to equal pKw ie 14

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