The value of Ka in water at 25 C for propionic acid (C2H5CO2H)is 3 4 x...

proponoic acid is a week acid construct the ICE table C2H5CO2 ....

The value of Ka in water at 25 Â°C for propionic acid (C2H5CO2H) is 3.4 x...

3.7 Ratings (442 Votes)

proponoic acid is a week acid

construct the ICE table

Â Â Â Â Â Â Â Â Â C2H5CO2H + H2O <------> C2H5CO2^- + H3O+

IÂ Â Â Â Â Â Â Â Â Â Â 0.02Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0

CÂ Â Â Â Â Â Â Â Â Â -xÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â +xÂ Â Â Â Â Â Â Â Â Â Â Â Â Â +x

EÂ Â Â Â Â Â Â Â Â Â Â 0.02-xÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â +xÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â +x

now dissociation constant

Ka = [C2H5CO2-][H3O+] / [C2H5CO2H]

3.4 x 10^-5 = [x][x] / [0.02-x]

x² + x 3.4 * 10-5 - 6.8 x 10^-7 = 0

solve the quadratic equation to get x value

x = 0.0008078 M = [H3O+]

now

pH = -log[H3O+] = -log[0.0008078] = 3.09

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