You have a 593.3 mL sample of 2.511 M HA (Ka = 8.56 ⋅ 10 −...

You have a 593.3 mL sample of 2.511 M HA (Ka = 8.56 ⋅ 10 − 2 ). Calculate the pH of the best buffer.

Expert Solution

HA ------------------------> H+ + A-

2.511 0 0

-x +x +x

2.511-x x x

Ka = x^2 / 2.511-x = 8.56 x 10^-2

x^2 + 8.56 x 10^-2 x - 0.2149 = 0

x = 0.4227

[H+] = 0.4227 M

pH = -log [H+]

pH = -log (0.4227)

pH = 0.374

queen_honey_blossom answered 2 years ago

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