The formula of soda ash is

Options

A. `Na_(2)CO_(3). 10 H_(2)O`
B. `Na_(2)CO_(3).2H_(2)O`
C. `Na_(2)CO_(3). H_(2)O`
D. `Na_(2)CO_(3)`

Explanation

To find the formula of soda ash, we can follow these steps:

### Step 1: Understand what soda ash is
Soda ash is a common name for sodium carbonate, which is a chemical compound that consists of sodium, carbon, and oxygen.

### Step 2: Identify the components of soda ash
Soda ash is composed of:
- Sodium (Na)
- Carbon (C)
- Oxygen (O)

### Step 3: Determine the ratio of elements in soda ash
In sodium carbonate, there are:
- 2 sodium atoms
- 1 carbon atom
- 3 oxygen atoms

### Step 4: Write the chemical formula
Based on the components and their ratios, the chemical formula for soda ash is:
\[ \text{Na}_2\text{CO}_3 \]

### Step 5: Conclusion
Thus, the formula of soda ash is Na₂CO₃.

---