**Formula of Washing Soda:**

The chemical formula of washing soda, also known as sodium carbonate, is Na2CO3. It is an inorganic compound that consists of two sodium (Na) atoms, one carbon (C) atom, and three oxygen (O) atoms.

**Explanation:**

Washing soda is a white, crystalline solid that is highly alkaline in nature. It is commonly used in household cleaning and laundry products due to its ability to remove stains and soften water. The formula of washing soda can be understood in detail as follows:

1. **Sodium (Na):** Washing soda is primarily composed of sodium ions (Na+). Sodium is an alkali metal that is highly reactive and readily forms compounds.

2. **Carbon (C):** Washing soda also contains a carbon atom (C). Carbon is a versatile element that can form various chemical compounds.

3. **Oxygen (O):** Washing soda consists of three oxygen atoms (O). Oxygen is a vital element that is present in many compounds and is essential for various chemical reactions.

4. **Ions:** The formula Na2CO3 indicates that washing soda contains two sodium ions (Na+) and one carbonate ion (CO3^2-). The sodium ions are positively charged, while the carbonate ion is negatively charged.

5. **Crystalline Structure:** Washing soda forms a crystalline structure due to the arrangement of its atoms. The sodium ions and carbonate ions are held together by ionic bonds, creating a stable crystal lattice.

6. **Alkalinity:** Washing soda is highly alkaline, meaning it has a high pH. This alkalinity is due to the presence of the carbonate ion, which can accept hydrogen ions (H+) and increase the concentration of hydroxide ions (OH-) in a solution.

Overall, the formula Na2CO3 represents the composition and structure of washing soda, which consists of sodium ions and carbonate ions. This compound's alkalinity and chemical properties make it an effective ingredient in various cleaning and laundry products.

Washing soda is a chemical compound with the formula Na2CO3, known as sodium carbonate, and it's a salt of carbonic acid.