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mamaluj [8]
3 years ago
6

A lactic acid/lactate ion buffer solution contains 0.14 M HC3H5O3 and 0.83 M C3H5O3−, respectively. The Ka value of lactic acid

is 1.4×10−4. Calculate the pH of this buffer.
Chemistry
2 answers:
yKpoI14uk [10]3 years ago
6 0
Use Henderson Hasselbache
PH=pka+log([salt]/[acid])
Pka=-log(ka)
-log(1.4x10^-4)= 3.85
log(.83/.14)= .77
3.85+.77= 4.62
PH=4.62
AlladinOne [14]3 years ago
5 0

<u>Answer:</u> The pH of the buffer is 4.62

<u>Explanation:</u>

The chemical reaction for the hydrolysis of lactic acid follows the equation:

HC_3H_5O_3+H_2O\rightleftharpoons C_3H_5O_3^-+H_3O^+

To calculate the pH of acidic buffer, we use the equation given by Henderson Hasselbalch:

pH=pK_a+\log(\frac{[salt]}{[acid]})

pH=pK_a+\log(\frac{[C_3H_5O_3^-]}{[HC_3H_5O_3]})

We are given:

pK_a = negative logarithm of acid dissociation constant of lactic acid = 3.85

[C_3H_5O_3^-]=0.83M

[HC_3H_5O_3]=0.14M

pH = ?

Putting values in above equation, we get:

pH=3.85+\log(\frac{0.83}{0.14})\\\\pH=4.62

Hence, the pH of the buffer is 4.62

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