Lab: Measuring pH
Assignment: Lab Report
Title: Measuring pH
Objective:
The objective of this lab is to measure the pH of various substances using pH paper and a pH meter.
Materials:
- pH paper
- pH meter
- Distilled water
- Vinegar
- Lemon juice
- Milk
- Soap solution
Procedure:
1. Start by calibrating the pH meter according to the manufacturer's instructions.
2. Dip a strip of pH paper into distilled water and observe the color change to determine the pH level.
3. Use the pH meter to measure the pH level of the distilled water and record the reading.
4. Repeat steps 2 and 3 for vinegar, lemon juice, milk, and soap solution.
5. Compare the results obtained from the pH paper and pH meter.
Results:
- Distilled water: pH paper - neutral (pH 7), pH meter - 7
- Vinegar: pH paper - acidic, pH meter - 3
- Lemon juice: pH paper - acidic, pH meter - 2
- Milk: pH paper - slightly acidic, pH meter - 6
- Soap solution: pH paper - alkaline, pH meter - 9
Conclusion:
In this lab, we measured the pH levels of various substances using pH paper and a pH meter. The results obtained from both methods were consistent with each other. Distilled water was neutral with a pH of 7, vinegar and lemon juice were acidic with pH levels of 3 and 2 respectively, milk was slightly acidic with a pH of 6, and soap solution was alkaline with a pH of 9. Overall, this lab demonstrated the importance of measuring pH in different substances for various applications.