The solution of sodium carbonate has pH

Options

A. Greater than 7
B. Less than 7
C. Equal to 7
D. Equal to zero

Explanation

To determine the pH of a sodium carbonate (Na2CO3) solution, we can follow these steps:

### Step 1: Identify the components of sodium carbonate
Sodium carbonate is composed of sodium ions (Na⁺) and carbonate ions (CO₃²⁻).

### Step 2: Determine the nature of the ions
- Sodium ion (Na⁺) is derived from a strong base, sodium hydroxide (NaOH).
- Carbonate ion (CO₃²⁻) is derived from a weak acid, carbonic acid (H₂CO₃).

### Step 3: Analyze the strength of the components
Since NaOH is a strong base, it completely dissociates in solution. H₂CO₃ is a weak acid and does not completely dissociate. The presence of a strong base and a weak acid indicates that the solution will be basic.

### Step 4: Predict the pH of the solution
In a solution where a strong base is present, the pH will be greater than 7. This is because the strong base will increase the concentration of hydroxide ions (OH⁻) in the solution, leading to a higher pH.

### Conclusion
Thus, the pH of a sodium carbonate solution will be greater than 7.

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