Strong base is dissolved in 685 mL of 0.400 M weak acid (Ka = 4.21 × 10-³) to make a buffer with a pH of 3.98. Assume that the volume remains constant when the base is added. НА(аq) + ОН (аq) H,O(1) + A¯(aq) Calculate the pK, value of the acid, and determine the number of moles of acid initially present. pKa = initial amount: mol HA 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 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.