1. If the H⁺ concentration is 0.0001 M/l, what is the pH?

2.  If the H⁺ concentration is 0.00001 M/l, what is the OH^- concentration?

3.  If the H⁺ concentration is 0.00005 M/l, what is the pH?

4. If a soil has a pH of 4.7, what is the H⁺ concentration of the soil solution?

5. Convert the following concentrations into parts per million:
     At wts:  Ca²⁺ = 40, H⁺ = 1, Mg²⁺ = 24, K⁺ = 39

10 meq Ca/100 g soil

1 meq H/100 g soil

2 meq Mg/100 g soil

2 meq K/100 g soil

6.  If the CEC is 20 meq/100 g soil and analyses find 12 meq Ca/100 g, 2 meq K/100 g, 1 meq Mg/100 g, 1 meq Na/100 g, 0.5 meq H/100 g, and 3.5 meq Al/100 g, what is the percentage base saturation?

7. What is a reasonable estimate of the pH of the soil in problem #5?