A weak acid is titrated against a strong base and the volume (V) of titrant added, is plotted agains — AITS & Test Series Chemistry Question
Question
A weak acid is titrated against a strong base and the volume (V) of titrant added, is plotted against pH as shown below: [A titration curve is shown with pH on y-axis and Volume (V) on x-axis. The curve shows two equivalence points at V1 and V2, with pH transitions at approximately pH 4, pH 10, and pH 14. Figure not to scale.] Which of the following statement(s) regarding above titration is/are correct?
💡 Solution & Explanation
2 2 H A OH HA H O 2 2 HA OH A H O AITS-OT (Paper-1)-PCM(Sol.)-JEE(Advanced)/20 FIITJEE Ltd., FIITJEE House, 29-A, Kalu Sarai, Sarvapriya Vihar, New Delhi -110016, Ph 46106000, 26569493, Fax 26513942 website: www.fiitjee.com 12 At first equivalent point, volume of base used is V1 and at second equivalence point, it is V2. So, V2 = 2V1. When, 1 3V V , 2 conc. of HAand 2 A will be equal and a buffer will be formed, so, 2 a pH pK . Also, when 1 V V , 2 first buffer will be formed containing H2A and Ain equal concentration. So, 1 a pH pK .