Strong base is dissolved in 645 mL of 0.200 M weak acid (K₂ = 3.64 × 10-5) to make a buffer with a pH of 4.11. Assume that the volume remains constant when the base is added. HA(aq) + OH-(aq) → H₂O(1) + A¯(aq) Calculate the pK, value of the acid, and determine the number of moles of acid initially present. pK₂ - initial amount: When the reaction is complete, what is the concentration ratio of conjugate base to acid? [A] [HA] How many moles of strong base were initially added? amount added: mol HA mol OH™

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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.