NOCTI Biomed Practice Exam 2025 - Free NOCTI Biomed Practice Questions and Study Guide

Question: 1 / 400

In the pH calculation formula, what does 'pH' represent?

The ratio of hydrogen ions to hydroxide ions

The negative logarithm of the hydronium ion concentration

In the context of pH calculations, 'pH' specifically represents the negative logarithm of the hydronium ion concentration in a solution. This means that as the concentration of hydronium ions (H3O+) increases, the pH value decreases, indicating a more acidic solution. Conversely, if the concentration of hydronium ions decreases, the pH increases, showing a more basic (alkaline) solution.

This concept is fundamental in chemistry and biology since pH is a crucial parameter that affects various biochemical processes and the behavior of molecules in solution. The scale typically ranges from 0 to 14, with 7 being neutral. Values below 7 indicate acidity and values above 7 indicate alkalinity.

The other choices do not accurately define pH or pertain to its calculation, which further reinforces why this option is the correct choice.

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The concentration of dissolved salts

The ratio of dissolved oxygen to carbon dioxide

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