Assistant Laboratory Animal Technician (ALAT) Practice Exam

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What does "pH" measure in a solution?

  1. Temperature

  2. Concentration of hydrogen ions

  3. Viscosity

  4. Density

The correct answer is: Concentration of hydrogen ions

"pH" specifically measures the concentration of hydrogen ions in a solution, which reflects the acidity or alkalinity of that solution. The pH scale ranges from 0 to 14, with lower values indicating higher acidity (more hydrogen ions) and higher values indicating higher alkalinity (fewer hydrogen ions). A neutral pH of 7 corresponds to a balanced concentration of hydrogen ions and hydroxide ions. This measurement is critical in various scientific and laboratory settings, as it can influence chemical reactions, biological processes, and the solubility of compounds. Understanding pH is essential for maintaining appropriate conditions in experiments and ensuring the health of laboratory animals, as many biological systems are sensitive to changes in pH.