Name a sodium compound which is a constituent of many dry soap powders.

Options

A. Trisodium phosphate
B. Finely dividend sand
C. powdered pumice
D. All of these

Answer

To solve the question, "Name a sodium compound which is a constituent of many dry soap powders," we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Context**: The question asks for a sodium compound that is commonly found in dry soap powders. Dry soap powders are often used for cleaning and laundry purposes.

2. **Research Common Ingredients**: We need to think about the typical ingredients found in dry soap powders. Common constituents include various sodium compounds.

3. **Consider Sodium Compounds**: Two well-known sodium compounds that are often used in dry soap powders are:
- Sodium carbonate (Na2CO3), which can also be found in its hydrated form as sodium carbonate decahydrate (Na2CO3·10H2O).
- Trisodium phosphate (Na3PO4), which is another common ingredient.

4. **Evaluate the Options**: The question may provide multiple-choice options. From the video transcript, we see that the correct answer is trisodium phosphate (Na3PO4).

5. **Conclude the Answer**: Based on the information gathered, the sodium compound that is a constituent of many dry soap powders is **trisodium phosphate (Na3PO4)**.

### Final Answer:
**Trisodium phosphate (Na3PO4)** is a sodium compound that is a constituent of many dry soap powders.

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