To dissolve argentite ore which of the following is

Options

A. `Na[Ag(CN)_2]`
B. NaCN
C. NaCl
D. HCl

Answer

To solve the question regarding the dissolution of argentite ore, we will follow a systematic approach:

### Step-by-Step Solution:

1. **Identify Argentite Ore**:
Argentite ore is primarily composed of silver sulfide (Ag₂S). Our goal is to extract silver from this ore.

**Hint**: Remember that argentite is a silver ore, and its chemical formula is crucial for the extraction process.

2. **Select the Extraction Method**:
The extraction of silver from argentite is typically done using a method called hydrometallurgy. This involves dissolving the ore in a suitable solvent.

**Hint**: Hydrometallurgy is a common method for extracting metals from their ores using aqueous solutions.

3. **Choose the Solvent**:
For argentite (Ag₂S), sodium cyanide (NaCN) is used as the solvent. The reaction involves the formation of a soluble complex.

**Hint**: Sodium cyanide is a key reagent in the cyanidation process for silver extraction.

4. **Chemical Reaction**:
When argentite reacts with sodium cyanide, it forms a soluble complex:
\[ \text{Ag}_2\text{S} + 4 \text{NaCN} \rightarrow 2 \text{Na}_2\text{[Ag(CN)}_2] + \text{Na}_2\text{S} \]
This reaction shows that argentite dissolves in the presence of sodium cyanide, forming a soluble silver cyanide complex.

**Hint**: Pay attention to the stoichiometry of the reaction and the formation of the complex.

5. **Removing Impurities**:
After the dissolution, the impurities can be removed through sedimentation and filtration. The soluble silver complex remains in the solution while impurities settle down.

**Hint**: Filtration is a common technique to separate solids from liquids in the extraction process.

6. **Completing the Reaction**:
To drive the reaction forward and ensure complete dissolution, sodium sulfide (Na₂S) can be removed by reacting it with oxygen (O₂) and water (H₂O), forming sodium sulfate (Na₂SO₄) and precipitating sulfur.

**Hint**: Understanding how to manipulate reaction conditions can help in maximizing yield.

7. **Final Product**:
The final product is a soluble silver complex, which can later be reduced to obtain pure silver.

**Hint**: The reduction step is crucial for obtaining the elemental form of silver from the complex.

### Conclusion:
To dissolve argentite ore, the correct reagent is **sodium cyanide (NaCN)**, which facilitates the extraction of silver through the formation of a soluble complex.

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