See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

10 milimoles of 3 4 1 H PO 20 2 10    Milimoles of NaOH = 4 3 4 2 4 2 H PO NaOH NaH PO H O 2 4 2 0 2 2    2 4 2 4 2 NaH PO NaOH Na HPO H O 2 2 4    i.e. the resulting solution contains 4 milimoles of 2 4 Na HPO . i.e. pH of the solution 2 3 pK pK 2   7 13 10 2    AITS-FT-XI-PCM(Sol.)-JEE(Main)/22 FIITJEE Ltd., FIITJEE House, 29-A, Kalu Sarai, Sarvapriya Vihar, New Delhi -110016, Ph 46106000, 26569493, Fax 26513942 website: www.fiitjee.com 9