ene ERy question/It is worth 1 point/ You have 4 of 5 attempts remaining/There i

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ene ERy question/It is worth 1 point/ You have 4 of 5 attempts remaining/There is no attempt penalty Question (1 point) a See page 668 1st attempt Feedback ? See Hint Gifblaar is a small South African shrub and one of the most poisonous plants known because it contains fluoroacetic acid (FCH2COOH), which has a pK of 2.59.Calculate the concentration of fluoroacetic acid in a solution that has the same pH as a 0.00560 Msolution of HCI. x 10-5 M 1.21 C TRY AGAIN VIEW SOLUTION 06:18 > 10 OF 18 QUESTIONS COMPLETED

Explanation / Answer

pH of HCl = -log(H3O+)

          = -log(0.0056)

          = 2.252

so that, pH of fluoroaceticacid = 2.252

[H3O+] = 10^-2.252 = 5.6*10^-3 M

         FCH2-COOH + H2O(l) <-----> FCH2-COO^-(aq) + H3O+(aq)

initial     x M                         0              0

change    5.6*10^-3 M                5.6*10^-3 M      5.6*10^-3 M

equil     x- 5.6*10^-3 M             5.6*10^-3 M      5.6*10^-3 M

   Ka = [FCH2-COO^-][H3O+]/[FCH2-COOH]

Ka = 10^-2.59 = 2.57*10^-3

(2.57*10^-3) = ((5.6*10^-3)^2/(x-(5.6*10^-3))

x = initial concentration of fluoroaceticacid = 0.0178 M

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