1. Soil Reactions Acidity and Alkalinity

2. n What is pH? n What is cation exchange capacity? n What are the applications in soil?

3. Household pH Scale How To Build Your Own pH Scale 1. Using cooked red cabbage juice fill each beaker to 50ml. 2. Then place one compound in each beaker, seven in all. 3. Carefully record each color change as it occurs. 4. Next determine which color is Acid or Alkaline. 5. Now you have your own pH scale. Lab is due at the end of the Hour

4. pH Scale neutral Range of Acidity Range of Alkalinity Range of Alkalinity 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Phosphoric Acid Distilled Water Lye BloodMilkTomatoesLemonsVinegarAmmonia Milk of Magnesia

5. Ion exchange of soil particles n Figure 1: n Mineral nutrients held on the surface of a soil particle are absorbed

6. Ion Exchange Of Soil Particles n Figure 2: n A soil particle with mostly hydrogen ions test n Acid

7. Ion Exchange Of Soil Particles n Figure 3: n A soil particle with mostly basic ions tests n Alkaline