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The SkepDoc

pH Mythology: Separating pHacts from pHiction

THE INTERNET IS A CORNUCOPIA OF facts, some true and some “alternative” (in other words, lies). One topic that is particularly plagued by misinformation is pH. People are restricting their diet, buying alkaline water, testing their urine with pH test strips, and buying into bogus cancer cures, all on the basis of false pseudoscientific claims. Going back to basics will help us distinguish pHacts from pHiction.

A Quick Primer: pH 101

pH stands for potential of hydrogen. It is a logarithmic scale from 0 to 14 that measures the concentration of hydrogen ions. Water is neutral at pH 7; solutions with a pH less than 7 are acidic; solutions with a pH greater than 7 are basic, or alkaline. Logarithmic means the units represent 10-fold differences: pH 4 indicates 10 times as many hydrogen ions as pH 5. The pH of blood is maintained within a narrow range of 7.34-7.45 by a process known as acid-base homeostasis. Deviations are quickly corrected by compensatory mechanisms in the lungs and kidneys. The pH of stomach acid is 1.5-3.5, human skin 4.7, cerebrospinal fluid 7.5, and pancreas secretions 8.1. None of these are affected by the composition of the diet. The pH of urine can range from 4.6 to 8.0; it changes as the kidneys re-establish homeostasis after an acid or alkaline load. The pH of urine does not reflect the pH in blood or anywhere else in the body.

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About Skeptic

ARTIFICIAL INTELLIGENCE DANGER ARTICLES: Why We Should Be Concerned About Artificial Superintelligence; Is Artificial Intelligence an Existential Threat?; Artificial Intelligence: Simulation, Not Synthesis; The Rise of the Alt-Right and the Politics of Polarization in America; Delusions of the Imagination: Debunking an Early 19th Century Medical Quack Device — The “Tractor”; Area 51: What is Really Going on There?; Is Race a Useful Concept?; The Three Shades of Atheism; COLUMNS: pH Mythology: Separating pHacts from pHiction; Are You An Unconscious Racist? REVIEWS of: Rethink: The Surprising History of New Ideas; How Men Age: What Evolution Reveals About Male Health and Mortality; Not a Scientist: How Politicians Mistake, Misrepresent, and Utterly Mangle Science; Big Con: Great Hoaxes, Frauds, Grifts, and and Swindles in American History by Nate Hendley; Fraud: An American History from Barnum to Madoff; Homo Deus: A Brief History of Tomorrow JUNIOR SKEPTIC: Chemtrails
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