The weak acid that would be best used when preparing a buffer solution would be An acid with Ka = 2.1 x 10-9
In chemistry, an acid is used to denote any substances that has the power to turn a litmus paper red and also has a sour taste when in a water solution.
How to solve for the weak acid
The pH needed for the buffer to be made is given as 8.7
We have the following equation
pH = PkA
-logKa = 8.7
Such that Ka = 10^-87
= 2.1 x 10^-9
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