A sample weighing 1.25 g of the diprotic acid potassium acid phthalate (KHP) is dissolved in 50.0 ml of water. Consider the titration of this solution with 0.100 M NaOH. The two Ka’s for KHP are 1.12 x 10-3 and 3.90 x 10-6.   a. Calculate the pH of this solution before adding any NaOH.   b. How many ml of NaOH must be added to reach the equivalence point? What is the pH at the equivalence point?     c. Calculate the pH of the solution after 100. ml of NaOH have been added.

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Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.