What contributes to the acidity or alkalinity measured by pH?

What contributes to the acidity or alkalinity measured by pH?

• A. The presence of sodium in the solution
• B. The concentration of hydroxide ions
• C. The concentration of hydrogen ions
• D. The amount of dissolved gas in the solution

Answer: (C)

The pH scale measures the acidity or alkalinity of a solution based on the concentration of hydrogen ions (H⁺) present. A solution is considered acidic if it has a high concentration of hydrogen ions and a low pH value, while a solution is alkaline if it has a low concentration of hydrogen ions and a high pH value. The relationship is logarithmic; for every unit change in pH, the hydrogen ion concentration changes by a factor of ten. Thus, it is the concentration of hydrogen ions that directly influences the pH readings, confirming that this choice is the key factor in determining acidity or alkalinity.

The pH scale measures the acidity or alkalinity of a solution based on the concentration of hydrogen ions (H⁺) present. A solution is considered acidic if it has a high concentration of hydrogen ions and a low pH value, while a solution is alkaline if it has a low concentration of hydrogen ions and a high pH value. The relationship is logarithmic; for every unit change in pH, the hydrogen ion concentration changes by a factor of ten. Thus, it is the concentration of hydrogen ions that directly influences the pH readings, confirming that this choice is the key factor in determining acidity or alkalinity.