The equivalent weight of iron in ferric chloride is ( At.wt. of Fe = 55.8) -

Options

A. 25.8
B. 18.6
C. 71.8
D. 23.6

Answer

To find the equivalent weight of iron in ferric chloride (FeCl₃), we can follow these steps:

### Step 1: Identify the oxidation state of iron in ferric chloride.
Ferric chloride contains iron in the +3 oxidation state. This can be represented as Fe³⁺.

### Step 2: Determine the atomic weight of iron.
The atomic weight of iron (Fe) is given as 55.8 g/mol.

### Step 3: Identify the valency of iron in ferric chloride.
The valency of iron in this case is +3, as it is in the +3 oxidation state.

### Step 4: Calculate the equivalent weight of iron.
The equivalent weight can be calculated using the formula:
\[ \text{Equivalent weight} = \frac{\text{Atomic weight}}{\text{Valency}} \]
Substituting the values we have:
\[ \text{Equivalent weight of Fe} = \frac{55.8 \, \text{g/mol}}{3} = 18.6 \, \text{g/equiv} \]

### Final Answer:
The equivalent weight of iron in ferric chloride (FeCl₃) is 18.6 g/equiv.

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