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What Is pH Balance in the Body?
pH balance is a fundamental aspect of human physiology that rarely enters everyday health conversations — yet maintaining the blood's pH within an extremely narrow range is one of the body's most c...
Medically reviewed by Dr. Michael Rodriguez · Editorial Policy
pH balance is a fundamental aspect of human physiology that rarely enters everyday health conversations — yet maintaining the blood's pH within an extremely narrow range is one of the body's most critical homeostatic priorities. The acids and bases produced by normal metabolism are potentially lethal if not continuously neutralized, and the multiple regulatory systems that keep blood pH between 7.35 and 7.45 represent some of the most elegant examples of physiological coordination in biology.
THE BASICS OF pH
pH is a measure of the hydrogen ion (H+) concentration in a solution, expressed on a logarithmic scale from 0 to 14. Pure water at 25°C has a pH of 7.0 (neutral). Solutions with pH below 7 are acidic (higher H+ concentration); solutions above 7 are basic/alkaline (lower H+ concentration).
Because the scale is logarithmic, each unit change in pH represents a 10-fold change in H+ concentration. The difference between blood pH of 7.35 and 7.45 — apparently a tiny range — actually represents nearly a 30% difference in H+ concentration.
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Primary Source
NIH MedlinePlus — Acid-Base BalanceMedical Disclaimer: This article is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of your physician or other qualified health provider with any questions you may have regarding a medical condition.
About the Author
Dr. Michael Rodriguez
AI Mental Health Specialist
Dr. Michael Rodriguez is Caraly's mental health educator, bringing compassionate, evidence-based information on anxiety, depression, OCD, trauma, ADHD, and overall psychological wellbeing. His work is grounded in the belief that mental health is health — and that reducing stigma begins with accurate, accessible education. Dr. Rodriguez has authored over 70 articles on the platform, making him one of the most comprehensive mental health content resources available online. All content is developed in alignment with guidelines from the National Institute of Mental Health (NIMH), the American Psychological Association (APA), and SAMHSA.
Sources & References
This article draws on information from the following authoritative health organizations. Always consult a qualified healthcare professional for personal medical advice.