jeffro198004
26.07.2019 •
Chemistry
Determine the ph of a 0.461 m c6h5co2h m solution if the ka of c6h5co2h is 6.5 x 10-5.
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Ответ:
The pH of 0.461 M C6H5CO2H is 2.27
pH and KapH of a solution is the negative logarithm to base 10 of hydrogen ion concentration of a solution Ka or acid dissociation constant is a constant used to express the ratio of products to reactant of a given weak acid.pH from dissociation of C6H5CO2HEquation of dissociation of C6H5CO2 is given below:
C6H5CO2 > C6H5CO2- + H+
Using an ICE table
C6H5CO2 > C6H5CO2- + H+
Initial concentration of C6H5CO2H = 0.461
Initial concentration of C6H5CO2- = 0
Initial concentration of H+ = 0
Change in concentration of C6H5CO2H = -X
Change in concentration of C6H5CO2- = +X
Change in concentration of H+ = +X
Equilibrium concentration of C6H5CO2H = 0.461 - X
Equilibrium concentration of C6H5CO2- = X
Equilibrium concentration of H+ = X
Ka of C6H5CO2H = 6.5 x 10-5
Ka = [H+][C6H5CO2-]/[C6H5CO2H]6.5 x 10-5 = X × X / 0.461 - X
X^2 = 6.5 × 10-5 (0.461 - X)
Assuming x is very small, 0.461 - X = 0.461
Solving for X:X = 0.0054
Therefore [H+] = 0.0054
pH = -log[H+]
pH = - log 0.0054
pH = 2.27
Therefore, the pH of 0.461 M C6H5CO2H is 2.27
Learn more about pH and Ka at: link
Ответ:
C6H5CO2H ↔ C6H5CO2- + H +
intial 0.461 0 0
change -X +X +X
Equ (0.461 - X) X X
when Ka = [H+] [C6H5CO2-] / [C6H5CO2H]
6.5 x 10^-5 = X * X / (0.461-X) by solving for X
∴ X = 0.0054
∴[H+] = 0.0054
∴ PH = -㏒[H+]
= -㏒0.0054
= 2.27
Ответ:
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