Calculate the pH of the solution obtained by mixing 100 `cm^(3)` of solution with pH = 3 with `400 cm^(3)` of solution with pH = 4 .

Explanation

To calculate the pH of the solution obtained by mixing 100 cm³ of a solution with pH = 3 and 400 cm³ of a solution with pH = 4, we can follow these steps:

### Step 1: Calculate the concentration of H⁺ ions in each solution

1. **For the solution with pH = 3:**
\[ \text{pH} = 3 \implies [\text{H}^+] = 10^{-3} \text{ M} \]
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