Aim
To find the pH of the following samples by using pH paper/universal indicator: dilute HCl, dilute NaOH, ethanoic acid, lemon juice, water, and dilute sodium bicarbonate solution.
Materials Required
pH Paper / Universal Indicator
Test Tubes
Test Tube Stand
Dropper
Solution Samples
Procedure
- Take a small strip of pH paper.
- Put a drop of the solution on it OR dip it in the solution.
- Observe the color change on the pH paper.
- Compare the color with the standard universal pH color chart.
- Record the pH value corresponding to the matched color.
- Classify the nature of the solution as acidic (pH < 7), neutral (pH = 7), or basic (pH > 7).
- Repeat the process for all provided solutions.
Precautions
- Use fresh pH paper for each test.
- Do not touch the testing area of the pH paper with fingers.
- Handle acids and bases carefully.
- Rinse the dropper thoroughly with distilled water between different solutions.
Drag the Universal Indicator dropper or click on a test tube to test its pH.
Select a solution or drag the dropper to test pH.
Observation Table
| S.No. | Solution | Color of Liquid | pH Value | Nature |
|---|
📹 Video Tutorial
💡 Watch this video to see how the experiment is performed in a real lab.
Assessment
Lab Report
Observation Summary
| S.No. | Solution | Color of Liquid | pH Value | Nature |
|---|---|---|---|---|
| No observations recorded yet. Complete the simulation and record your readings. | ||||
Conclusion
Based on the pH values, HCl and lemon juice are strongly acidic, ethanoic acid is weakly acidic, water is neutral, sodium bicarbonate is weakly basic, and NaOH is strongly basic.