Materials needed:
- Sodium carbonate (Na2CO3)
- Distilled or deionized water
- pH meter or pH test strips
- Stirring rod
Procedure:
1. Prepare Sodium Carbonate Solution:
- Weigh accurately about 1 gram (or the amount specified in your experiment) of sodium carbonate using an analytical balance.
- Dissolve the sodium carbonate in 100 mL of distilled or deionized water in a clean beaker.
- Stir the solution thoroughly using a stirring rod to ensure complete dissolution.
2. Calibrate pH Meter (if using):
- If you are using a pH meter, ensure that it is properly calibrated according to the manufacturer's instructions.
3. Measure pH:
- Immerse the pH electrode or dip the pH test strip into the prepared sodium carbonate solution.
- Wait for the pH meter to stabilize or for the color change on the test strip to occur.
4. Record pH Value:
- Read and record the pH value displayed on the pH meter or observe the color change on the pH test strip and match it with the pH color chart provided with the test kit.
Interpretation:
The pH value recorded represents the acidity or basicity of the sodium carbonate solution. A pH value of 7 indicates a neutral solution, values below 7 indicate acidity, and values above 7 indicate basicity (alkalinity).
Sodium carbonate is a basic salt, and when dissolved in water, it undergoes hydrolysis, leading to the formation of hydroxide ions (OH-) and carbonate ions (CO3^2-). The presence of hydroxide ions contributes to the alkaline nature of the sodium carbonate solution, resulting in a pH value greater than 7.
