Significance acid - base equilibrium for normal operating the living organism

The notion about acid-base indicators.

Hydrogen potential pH as measure of active acidity and basidity.

The pH of a solution is a measure of the molar concentration of hydrogen ions in the solution and as such is a measure of the acidity or basicity of the solution. The letters pH stand for "power of hydrogen" and the numerical value is defined as the negative base 10 logarithm of the molar concentration of hydrogen ions. pH = -log10[H+]

Numerical examples from Shipman, Wilson and Todd.

An acid-base indicator is a weak acid or a weak base. The undissociated form of the indicator is a different color than the iogenic form of the indicator. An Indicator does not change color from pure acid to pure alkaline at specific hydrogen ion concentration, but rather, color change occurs over a range of hydrogen ion concentrations. This range is termed the color change interval. It is expressed as a pH range.

The processes of metabolism generate hydrogen ions. The body's acid-base balance is tightly regulated. Several buffering agents that reversibly bind hydrogen ions and impede any change in pH exist. For humans to survive, the pH of the blood must be maintained between 7.35 and 7.45.

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