Question

Which statement is correct? A. pKa is not an indicator of acid strength. B. An acid with a small Ka is stronger than an acid with a large Ka. C. An acid with a large pKa is stronger than an acid with a small pKa. D. An acid with a small pKa is stronger than an acid with a large pKa.

Answer 1

Answer:

D

Explanation:

Since [pKa = - log Ka]....hence..,the larger the Ka value,the stronger the acid is..so this means that the pKa is vice versa

Saying that the smaller the pKa value..the stronger the acid is.

Answer 2

Answer:

D) An acid with a small pKa is stronger than an acid with a large pKa

Explanation:

Hi, the acity constant (Ka) gives an idea of the strenght of an acid. The higher the Ka, the stronger the acid.

The indicator pKa is obtained by the following formula:

$pKa=-\log{Ka}$

Due to the logarithm, when the Ka increases, the pKa decreases.

Putting all this toghether: An acid with a large Ka has a small pKa and is stronger than an acid with a small Ka (large pKa).

So the correct statement is D