Question

Given the following information: hypochlorous acid HCIO CoH3COOH Ka = 3.5x10-8 Kg = 6.3x10-5 benzoic acid (1) Write the net ionic equation for the reaction that occurs when equal volumes of 0.246 M aqueous hypochlorous acid and sodium benzoate are mixed. It is not necessary to include states such as (aq) or (s). (2) At equilibrium the will be favored. (3) The pH of the resulting solution will be _ seven. Submit Answer

Answer 1

- Ans Guiven Hypochlorus acid, HUOand sodium benzehte auce mixed (lehty coo Nat) HUO Ka=3.5810-8 GH SCOOH, Ka= 6.3x10-5 Cols Nat is the conjugate base of Shy COOH for conjugate acial base pair, Ка Кь = Ko - Kw = Lonic Product of water = 10-14 y Ko (C6 H100-) E 10-14 Ka = 10-14 6.3x10-5 Kb ~ 1.6 X 10 -10

Similarly for clo- (conjugate base of Hool Koecilo) Kw Ко. = 10-14 = 2.86 x 10-7 3.5*10-8 Kb (00-) = 2.86 x 10-7 (1) The net ionic reaction that occurs is

Hao (s) + acid L C6H5600-lug) basel CGHSCOOH (S) + acid 2 a co-lag) base 2 We have acid base f. Ka= £ R b = 3.5 x 10-68 1.6 x 10-10 acid 2 base 2 Ka= 6.3x10-5 ko = 2.86 x 10-7 We must remember that for acid-base geaction, the equilibrium always favours in the direction of strongesc acid-base puis toward weakne acid base pair Higher the value of Ka & Ko stronger is the acid or base.

(2) In the reaction above, as we have calculated Ka & Kb for products is greater than reaction. At Equilibrium, the reaction will be favowed backwards - Hencer paradites le reactants will be favouredo (3) since at equilibrium, reactants are more favowed of. CH 5600- & HUU. Ka (HCIO) = 3.5*10-8 Kb C GG H5(00-) = 1.68.10-10 As. KayKb =) in the resulting solution will be acidic pH <7 Hence the pH will be less than seven.