Question

The hydrogen ion concentration of a solution is indicated by its ___ value.

Answer 1

The hydrogen ion concentration of a solution is indicated by its pH value.

Explanation:

• A measure of acidity or alkalinity of water soluble substances (pH stands for 'potential of Hydrogen'). A pH value is a number from 1 to 14, with 7 as the middle point.
• Under normal circumstances this means that the concentration of hydrogen ions in acidic solution can be taken to be equal to the concentration of the acid.
• The pH is then equal to minus the logarithm of the concentration value.
• Values below 7 indicate acidity which increases as the number decreases, 1 being the most acidic.
• The pH of a solution is a measure of hydrogen ion concentration, which in turn is a measure of its acidity.
• Pure water dissociates slightly into equal concentrations of hydrogen and hydroxyl (OH−) ions. For a neutral solution, [H+] is 10−7, or pH = 7.