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 the concept of Normality
Normality (N) is defined as the number of equivalents of solute per liter of solution. In the case of 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: Use the formula for milliequivalents
The formula to calculate milliequivalents (mEq) is:
\[ \text{Milliequivalents} = \text{Normality (N)} \times \text{Volume (ml)} \]

### Step 3: Plug in the values
Given:
- Normality (N) = 0.5 N
- Volume = 100 ml

Now, substituting the values into the formula:
\[ \text{Milliequivalents} = 0.5 \, \text{N} \times 100 \, \text{ml} \]

### Step 4: Calculate the result
\[ \text{Milliequivalents} = 0.5 \times 100 = 50 \, \text{mEq} \]

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

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