The number of milli equivalent in 100 ml of 0.5 N HCl solution is

Options

A. 200
B. 100
C. 50
D. 25

Explanation

To find the number of milliequivalents in 100 ml of a 0.5 N HCl solution, we can follow these steps:

### Step 1: Understand Normality
Normality (N) is defined as the number of equivalents of solute per liter of solution. For HCl, which is a strong acid, 1 equivalent is equal to 1 mole of HCl because it donates one proton (H⁺) per molecule.

### Step 2: Convert Volume from ml to Liters
We have the volume of the solution given as 100 ml. To convert this to liters:
\[ \text{Volume in liters} = \frac{100 \text{ ml}}{1000} = 0.1 \text{ L} \]

### Step 3: Calculate the Number of Equivalents
Using the formula for normality:
\[ \text{Normality (N)} = \frac{\text{Number of equivalents}}{\text{Volume in liters}} \]
We can rearrange this to find the number of equivalents:
\[ \text{Number of equivalents} = \text{Normality (N)} \times \text{Volume in liters} \]
Substituting the values:
\[ \text{Number of equivalents} = 0.5 \text{ N} \times 0.1 \text{ L} = 0.05 \text{ equivalents} \]

### Step 4: Convert Equivalents to Milliequivalents
Since 1 equivalent = 1000 milliequivalents, we can convert equivalents to milliequivalents:
\[ \text{Number of milliequivalents} = 0.05 \text{ equivalents} \times 1000 = 50 \text{ milliequivalents} \]

### Final Answer
The number of milliequivalents in 100 ml of 0.5 N HCl solution is **50 milliequivalents**.

---