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What does the H refer to when using pH as a measurement?

  1. Heat

  2. Helium

  3. Hydrogen

  4. Hydroxide

The correct answer is: Heat

The correct answer is Hydrogen. The pH scale measures the concentration of hydrogen ions in a solution. It is a logarithmic scale, where lower pH values indicate a higher concentration of hydrogen ions, meaning the solution is more acidic, while higher pH values indicate a lower concentration of hydrogen ions, making the solution more basic or alkaline. Understanding pH in terms of hydrogen ions is essential in fields like chemistry, biology, and nutrition, as it affects various biochemical processes and chemical reactions.