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almond37 [142]
3 years ago
7

You have been observing an insect that defends itself from enemies by secreting a caustic liquid. Analysis of the liquid shows i

t to have a total concentration of formate plus formic acid (Ka =1.8 x 10^-4) of 1.45 M; the concentration of formate ion is 0.015 M. What is the pH of the secretion?
Chemistry
1 answer:
Yakvenalex [24]3 years ago
4 0

Answer:

pH = 1.76

Explanation:

The mixture of formate and formic acid produce a buffer. The pH of the buffer is obtained using H-H equation as follows:

pH = pKa + log [A-] / [HA]

<em>Where pH is the pH of the buffer:</em>

<em>pKa = -log Ka = 3.74</em>

<em>[A-] is molar concentration of conjugate base (Formate) = 0.015M</em>

<em>[HA] is molar concentration of weak acid (Formic acid) = 1.45M - 0.015M = 1.435M</em>

Replacing:

pH = 3.74 + log [0.015M] / [1.435M]

<h3>pH = 1.76</h3>
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