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DOST Science Practice Exam

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The term that represents the concentration of hydrogen ions in a solution is?
Correct Answer:
pH
Explanation:
Hydrogen ion concentration determines how acidic a solution is, and the term that expresses this is pH. It is defined as pH = -log10[H+], so it directly reflects the amount of hydrogen ions present. A low pH means a high hydrogen ion concentration, while a high pH means a lower hydrogen ion concentration. The other terms don’t describe hydrogen ion concentration specifically: molarity is a general measure of solute per liter, alkalinity is the capacity to neutralize acids, and pOH gauges hydroxide ion concentration (with pH and pOH adding to about 14 at room temperature).

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