How many times of the acetic acid concentration, acetate salt should be added to a given acetic acid solution to obtain a solution of pH = 7.0 (`K_a` for `CH_3COOH=1.8xx10^(-5)` ) .

Explanation

To solve the problem of how many times the concentration of acetic acid (CH₃COOH) should be added to a given acetic acid solution to obtain a solution of pH = 7.0, we can follow these steps:

### Step 1: Understand the relationship between pH, pKa, and the concentrations of acid and its conjugate base
We know that for a weak acid and its conjugate base, the pH of the solution can be calculated using the Henderson-Hasselbalch equation:
\[ \text{pH} = \text{pKa} + \log\left(\frac{[\text{A}^-]}{[\text{HA}]}\right) \]
where:
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