Materials Needed:

- Various liquid samples (e.g., coffee, water, vinegar, baking soda solution)

- pH test strips or a pH meter

- Test tubes or small containers

- Labels

- Safety glasses

Procedure:

1. Prepare your workspace. Wear safety glasses and ensure you have a clean and dry work area.

2. Label your test tubes or containers. Write the name or description of each liquid sample on the corresponding container.

3. Dip a pH test strip into each liquid sample. Follow the instructions provided with your pH test strips to determine the pH level of each sample.

4. Record the pH levels. Write down the pH value for each liquid sample next to its corresponding label.

5. Sort the liquids by pH. Arrange the test tubes or containers in order of increasing or decreasing pH, depending on your preference. For example, if you want to sort from acidic to basic, place the most acidic sample first, followed by progressively less acidic samples, and finally, the basic samples.

6. Verify the pH levels. If you have a pH meter, you can double-check the pH measurements obtained from the pH test strips by using the pH meter.

Additional Tips:

- Rinse the test tubes or containers thoroughly with distilled water between each sample to avoid cross-contamination.

- If using pH test strips, make sure they are fresh and within their expiration date for accurate results.

- When using a pH meter, calibrate it according to the manufacturer's instructions to ensure accurate readings.

- Be careful when handling acidic or basic solutions, as they can cause skin burns and eye irritation.