Question

NF is the only hydro halide (HX) that is NOT a strong acid! Hydrofluoric Acid is used as a precursor to almost all Fluorine compounds. One example is Fluoxetine, aka Prozac which is used to treat depression, bulimia, OCD and panic disorders. f the Equilibrium Concentration of 250 M HF (20.01 g/mol) is 0.23776 M, what is the Acid sivation Constant, ka? 250MER-0.23776 250 E .250 -x-Y 2 c (4877 7000) Ka 951701705 250 .952 b) What is the pH of the solution in part (a)? 7 pts. PH--log La527.021363052 .021 Aciic

Answer 1

MF > H+ + F Initial 0. 250M o o fquilibrium 0.23776MX X . (0.250 M-X)! .O. 250M -X = 0.23776 M. 2 = 0.250 M - 0.23776 M = 0.01224 M Equilibrium constant = Acid dissociation constant Ко 2 гн*1 Е) Xх - CHF 0.23776m a) ka = 0.01224 M X 0.01224M - 6.30 X10 0.23776 M Ka=6.30 x 10-4 pka = -log ka = -log (6.30 810-4) = + 3.20 Using Henderson Hasselbach equation & pH = pka + log [F] pH = + 3.20 + log 0.01224 M 10. 23776M 2+3.20 + log 0.0514... pH = 3.20 -1028 = 1092