Formic acid, Sodium formiate will generate a buffer solution with pH around 3. 5.
It must consider the acid whose pKa = pH in order to choose the base or acid that can produce a buffer solution with such a pH of about 3.5.
However, it also need to consider buffer capacity, which is a factor that can alter the pH of a solution by one unit in a liter.
The connection between the components' concentrations and their concentrations themselves affects buffer capacity in addition to their individual concentrations.
Therefore, Formic acid, Sodium formiate will generate a buffer solution with pH around 3. 5.
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