PLEASE HELP! I also attached some of the wrong answers. Thank you in advance. Gi

Question

PLEASE HELP! I also attached some of the wrong answers. Thank you in advance.

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 pHas a 0.00120 Msolution of HCl. 3rd attempt Feedback Ld See Periodic Table See Hint Gifblaar is a small South African shrub and one of themost poisonous plants known because it contains fluoroacetic acid (FCH2COOH), which has apK of 2.59. Calculate the concentration of fluoroacetic acid in a solution that has the same pHas a 0.00120 Msolution of HCl. 176 2nd attempt Feedback See Periodic Table 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 pHas a 0.00120 Msolution of HCl. 1st attempt Feedback See Periodic Table Q 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 pHas a 0.00120 Msolution of HCl. 477

Explanation / Answer

concentration of HCl = 0.00120 M

pH = -log (0.00120) = 2.92

pKa = 2.59

FCH2COOH    ---------------> FCH2COO-   + H+

    C                                               0                 0

C - x                                              x                  x

Ka = x^2 / C - x

2.57 x 10^-3 = (0.00120)^2 / C - 0.00120

C = 1.76 x 10^-3

concentration = 1.76 x 10^-3 M

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