Aluminium vessels should not be washed with materials containing washing soda since

Options

A. washing soda is expensive.
B. washing soda is easily decomposed.
C. washing soda reacts with auminium to form soluble aluminate.
D. washing soda reacts with aluminium to form insoluble aluminium oxide.

Explanation

### Step-by-Step Solution:

1. **Understanding the Composition of Washing Soda**:
- Washing soda is chemically known as sodium carbonate (Na2CO3). It is often used in cleaning agents due to its ability to soften water and remove grease.

2. **Reactivity of Aluminum**:
- Aluminum is a reactive metal but typically does not react with water due to the formation of a protective layer of aluminum oxide (Al2O3) on its surface. This layer prevents further corrosion.

3. **Effect of Sodium Hydroxide**:
- When washing soda is dissolved in water, it produces sodium hydroxide (NaOH). Sodium hydroxide is a strong base and can disrupt the protective aluminum oxide layer.

4. **Reaction Between Aluminum and Sodium Hydroxide**:
- In the presence of water, aluminum reacts with sodium hydroxide to form sodium meta-aluminate (NaAlO2), which is a soluble compound. The reaction can be represented as:
\[ 2 \text{Al} + 2 \text{NaOH} + 6 \text{H2O} \rightarrow 2 \text{NaAl(OH)4} + 3 \text{H2} \]
- This reaction shows that aluminum can dissolve in the presence of a strong base, leading to the formation of soluble aluminates.

5. **Conclusion**:
- Therefore, washing aluminum vessels with washing soda (sodium carbonate) is not advisable because it reacts with aluminum, leading to the formation of soluble aluminum compounds, which can damage the aluminum vessel over time.

### Final Answer:
Aluminum vessels should not be washed with materials containing washing soda because washing soda reacts with aluminum to form soluble aluminate, which can damage the vessel.

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