How to Find PH Levels

Knowledge of pH levels can be used for health, beauty, food, gardening and science. The pH value is the acidity or alkalinity of a substance such as urine, saliva, soap or soil. Using water as the neutral point of the spectrum with a pH of 7, you should remember that elements with a pH lower than 7 are considered acidic, while those with a pH higher than 7 are basic, or alkaline. A very easy, common and inexpensive way to test pH levels utilizes pH test strips. The paper strips indicate a range of pH levels that correspond with a color chart of pH levels.

Things You'll Need

• Sample substance
• pH level test strips

Instructions

1. Collect a sample of the substance you would like to test the pH level of. Liquid or gel consistencies test best when using the paper pH strips.

2. Dip the test strip into the collected sample to dampen the strip with the sample. Remove the strip from the sample.

3. Observe the test strip; it will begin to change color immediately. Wait five to 10 seconds to ensure that the sample element has been fully absorbed into the test strip. If the test strip is still changing color, continue to wait until it is no longer undergoing changes.

4. Compare the color on the pH level test strip to the corresponding color chart that came with your test strips, once the strip has stabilized.

5. Note whether your sample is acidic or alkaline. It is advisable to repeat these steps again with the same sample to ensure accuracy. Dispose of your used test strip. Never reuse a test strip, as the test would not be accurate.

Tips & Warnings

• Liquids test best when using paper pH strips.

• Avoid exposing strips to sunlight and moisture. Cool, dry locations are best for storage of test strips.

References

• University of Colorado: pH Scale