The final molarity of a solution made by mixing 50 mL of 0.5 M HCl, 150 mL of 0.25 M HCl and water to make the volume 250 mL is

Options

A. 0.5 M
B. 1M
C. 0.75 M
D. 0.25 M

Explanation

To find the final molarity of the solution made by mixing 50 mL of 0.5 M HCl, 150 mL of 0.25 M HCl, and water to make the total volume 250 mL, we can follow these steps:

### Step 1: Calculate the moles of HCl in the first solution (50 mL of 0.5 M HCl).
- **Formula**: Moles = Molarity × Volume (in liters)
- **Calculation**:
\[ \text{Moles from 0.5 M HCl} = 0.5 \, \text{M} \times \frac{50 \, \text{mL}}{1000 \, \text{mL/L}} = 0.5 \times 0.05 = 0.025 \, \text{moles} \]
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