To determine what Glauber's salt is, we will analyze the options provided and identify the correct one based on the chemical composition and characteristics of Glauber's salt.
### Step-by-Step Solution:
1. **Identify the Chemical Composition**:
- Glauber's salt is known to be a hydrated form of sodium sulfate. The chemical formula for sodium sulfate is Na2SO4.
2. **Examine the Options**:
- Option 1: Sodium sulfate (Na2SO4) - This is the anhydrous form and does not contain water.
- Option 2: Sodium sulfate dot 2 H2O (Na2SO4·2H2O) - This is a partially hydrated form but not Glauber's salt.
- Option 3: Sodium sulfate dot 5 H2O (Na2SO4·5H2O) - This is another partially hydrated form, still not Glauber's salt.
- Option 4: Sodium sulfate dot 10 H2O (Na2SO4·10H2O) - This is the fully hydrated form of sodium sulfate.
3. **Confirm the Hydration**:
- Glauber's salt specifically refers to sodium sulfate decahydrate, which means it contains 10 molecules of water for every formula unit of sodium sulfate.
4. **Conclusion**:
- Based on the analysis, the correct answer is sodium sulfate dot 10 H2O (Na2SO4·10H2O).
### Final Answer:
Glauber's salt is sodium sulfate decahydrate, represented by the formula Na2SO4·10H2O.
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