To solve this question, we need to understand the composition of washing soda and soda ash, particularly focusing on the water molecules associated with each compound.
Washing Soda: The chemical name for washing soda is Sodium Carbonate Decahydrate, represented as \(\text{Na}_2\text{CO}_3\cdot10\text{H}_2\text{O}\). This indicates that each formula unit of sodium carbonate is associated with 10 water molecules. Hence, washing soda is hydrated and contains 10 water molecules.
Soda Ash: Soda Ash is commonly known as anhydrous sodium carbonate, represented as \(\text{Na}_2\text{CO}_3\). It means it is devoid of any water molecules and is in an anhydrous form. Therefore, soda ash contains 0 water molecules.
From the explanation above, it is evident that the number of water molecules in washing soda is 10 and in soda ash is 0. Accordingly, the correct answer to the question is:
