The ionization constant of formic acid is `1.8xx10^(-4)`. Around what pH will its mixture with sodium formate give buffer solution of highest capacity ?

Explanation

To find the pH at which a mixture of formic acid and sodium formate will give a buffer solution of highest capacity, we can follow these steps:

### Step 1: Understand the Buffer System
A buffer solution consists of a weak acid and its conjugate base. In this case, formic acid (HCOOH) is the weak acid, and sodium formate (HCOONa) provides the conjugate base (formate ion, HCOO⁻).

### Step 2: Use the Henderson-Hasselbalch Equation
The pH of a buffer solution can be calculated using the Henderson-Hasselbalch equation:
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