Which of the following is known molecular formula of washing soda? — s Block Elements Chemistry Question

💡 Solution & Explanation

I notice the options aren't provided in your question, but I can explain the molecular formula of washing soda: **Washing soda is sodium carbonate decahydrate: $Na_2CO_3 \cdot 10H_2O$** **Step-by-step reasoning:** 1. **Washing soda's chemical identity**: Washing soda is the common name for sodium carbonate, a salt used in cleaning applications. 2. **Anhydrous form**: The basic compound is $Na_2CO_3$ (sodium carbonate), which contains 2 sodium atoms, 1 carbon atom, and 3 oxygen atoms. 3. **Hydrated form**: Washing soda naturally occurs and is commonly used as a hydrated salt with water molecules incorporated in its crystal structure. 4. **Water content**: It contains exactly **10 molecules of water** per formula unit of $Na_2CO_3$, making it a decahydrate. 5. **Complete formula**: Thus, the full molecular formula is: $$Na_2CO_3 \cdot 10H_2O$$ This is distinct from: - **Soda ash** = $Na_2CO_3$ (anhydrous form) - **Sal soda** = $Na_2CO_3 \cdot 10H_2O$ (another name for washing soda) If option A in your question shows $Na_2CO_3 \cdot 10H_2O$, that would be the correct answer.