25 mg of `CaCO_3` is dissolved in 5 L of solution. The approximate concentration of solution is

Options

A. 25 ppm
B. 2500 ppm
C. 1 ppm
D. 5ppm

Answer

To find the approximate concentration of the solution in parts per million (PPM), we can follow these steps:

### Step 1: Understand the formula for PPM
The concentration in PPM is calculated using the formula:
\[ \text{PPM} = \frac{\text{mass of solute (mg)}}{\text{volume of solution (L)}} \]

### Step 2: Identify the values from the question
From the question, we have:
- Mass of solute (CaCO₃) = 25 mg
- Volume of solution = 5 L

### Step 3: Substitute the values into the PPM formula
Now, we can substitute the values into the formula:
\[ \text{PPM} = \frac{25 \text{ mg}}{5 \text{ L}} \]

### Step 4: Calculate the concentration
Now, we perform the calculation:
\[ \text{PPM} = \frac{25}{5} = 5 \text{ PPM} \]

### Step 5: Conclusion
The approximate concentration of the solution is **5 PPM**.

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