`Mg(OH)_(2)darr+2HCl to MgCl_(2)+2H_(2)O`

Options

A. For precipitate formation reaction
B. For precipitate dissolution reaction
C. For precipitate exchange reaction
D. For no reaction

Answer

To determine the type of reaction represented by the equation \( \text{Mg(OH)}_2 + 2 \text{HCl} \rightarrow \text{MgCl}_2 + 2 \text{H}_2\text{O} \), we can follow these steps:

### Step 1: Identify the Reactants and Products
- **Reactants**: Magnesium hydroxide (\( \text{Mg(OH)}_2 \)) and hydrochloric acid (\( \text{HCl} \)).
- **Products**: Magnesium chloride (\( \text{MgCl}_2 \)) and water (\( \text{H}_2\text{O} \)).

### Step 2: Analyze the State of Reactants and Products
- \( \text{Mg(OH)}_2 \) is a precipitate, as indicated by the downward arrow in the reaction.
- \( \text{HCl} \) is an aqueous solution.
- \( \text{MgCl}_2 \) is also an aqueous solution, and \( \text{H}_2\text{O} \) is a liquid.

### Step 3: Determine the Type of Reaction
- In this reaction, \( \text{Mg(OH)}_2 \) (the precipitate) reacts with \( \text{HCl} \) to form \( \text{MgCl}_2 \) and \( \text{H}_2\text{O} \).
- The precipitate \( \text{Mg(OH)}_2 \) dissolves in the presence of hydrochloric acid, resulting in the formation of soluble products.

### Conclusion
Since a precipitate is present in the reactants and it dissolves to form soluble products, this reaction is classified as a **precipitate dissolution reaction**.

### Final Answer
The type of reaction is: **Precipitate Dissolution Reaction**.

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