`NaHCO_(3)` represents the formula of which one of the following?

Options

A. Sodium carbonate
B. Washing soda
C. Sodium acetate
D. Baking soda

Answer

To solve the question about what `NaHCO₃` represents, we can follow these steps:

### Step 1: Identify the components of the formula
The formula `NaHCO₃` consists of:
- `Na` which stands for sodium (Na⁺)
- `HCO₃` which is the bicarbonate ion (HCO₃⁻)

### Step 2: Analyze the options given
The options provided are:
1. Sodium carbonate
2. Washing soda
3. Sodium acetate
4. Baking soda

### Step 3: Compare `NaHCO₃` with the options
- **Sodium carbonate**: The formula for sodium carbonate is `Na₂CO₃`, which is different from `NaHCO₃`.
- **Washing soda**: Washing soda is another name for sodium carbonate (`Na₂CO₃`), so it does not match.
- **Sodium acetate**: The formula for sodium acetate is `CH₃COONa`, which is also different from `NaHCO₃`.
- **Baking soda**: The correct name for `NaHCO₃` is baking soda, which is commonly used in cooking.

### Step 4: Conclusion
Based on the analysis, `NaHCO₃` represents baking soda. Therefore, the correct answer is option **4 (Baking soda)**.

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