PROBLEM: Can pH be used to detect differences in soil?

PREDICTION:

MATERIALS: 3 soil samples, pH indicator paper, magnet, test tube, graduated cylinders (10 ml),  hand lens

PROCEDURE:

1. Describe each of the samples that you have. Use a magnifying glass and magnet to see if you can find any differences. 
2. Put about 2 ml of the soil in the mortar and grind it. Put the ground material into a beaker
3. Add 5  ml of water and mix thoroughly.
4. Use the pH indicator paper to determine the pH of the soil by putting the paper into the mixture and comparing it with the colors in the kit.

CONCLUSIONS: How are the soils different?