When pH changes from 7 to 6, how much does the hydrogen ion concentration change?

When pH changes from 7 to 6, how much does the hydrogen ion concentration change?

• A. It doubles
• B. It increases 10 fold
• C. It increases 100 fold
• D. It decreases by half

Answer: (B)

The pH scale is logarithmic, meaning that each whole number change on the scale represents a tenfold change in hydrogen ion concentration. When the pH value decreases from 7 to 6, it indicates an increase in acidity because the pH scale ranges from 0 (highly acidic) to 14 (highly basic). Specifically, moving from a pH of 7 to a pH of 6 signifies that the hydrogen ion concentration has increased by a factor of ten. Since the pH value of 6 corresponds to a higher concentration of hydrogen ions than a pH of 7, the correct statement is that the hydrogen ion concentration increases tenfold. This fundamental concept is crucial for understanding soil chemistry and nutrient availability in agricultural practices, as pH directly influences the solubility and availability of nutrients to plants.

The pH scale is logarithmic, meaning that each whole number change on the scale represents a tenfold change in hydrogen ion concentration. When the pH value decreases from 7 to 6, it indicates an increase in acidity because the pH scale ranges from 0 (highly acidic) to 14 (highly basic). Specifically, moving from a pH of 7 to a pH of 6 signifies that the hydrogen ion concentration has increased by a factor of ten. Since the pH value of 6 corresponds to a higher concentration of hydrogen ions than a pH of 7, the correct statement is that the hydrogen ion concentration increases tenfold. This fundamental concept is crucial for understanding soil chemistry and nutrient availability in agricultural practices, as pH directly influences the solubility and availability of nutrients to plants.