Write the reaction involving : Formation of dirty green ppt using iron salt.

Explanation

To write the reaction involving the formation of a dirty green precipitate using iron salt, we can follow these steps:

### Step 1: Identify the Iron Salt
The iron salt we are considering is ferrous sulfate, which can be represented as \( \text{FeSO}_4 \). In aqueous solution, it dissociates into ferrous ions \( \text{Fe}^{2+} \) and sulfate ions \( \text{SO}_4^{2-} \).

### Step 2: Add Hydroxide Ions
When we add a base, such as sodium hydroxide \( \text{NaOH} \), to the solution containing ferrous ions, hydroxide ions \( \text{OH}^- \) will react with the ferrous ions.

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