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sp2606 [1]
3 years ago
11

The pKa of a certain weak acid is 5.0. Calculate the ratio of proton acceptor to proton donor at pH 7.0.

Chemistry
1 answer:
Anna35 [415]3 years ago
5 0

Answer:

C) 100:1

Explanation:

To solve this question we must use H-H equation:

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

<em>Where pH = 7.0, pKa = 5.0, A- is proton aceptor and HA proton donor.</em>

<em />

Replacing:

7 = 5 + log [A-] / [HA]

2 = log [A-] / [HA]

100 = [A-] / [HA]

That means the ratio of proton aceptor:proton donor is:

<h3>C) 100:1</h3>
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