• Look up the pH of healthy blood (it is close to neutral, pH =7). The pH is the negative log (base 10) of the hydrogen ion concentration, so there you have it. For example, if the pH of blood was exactly 7, the negative of 7 is -7; and -7 is the log of 10 to the power -7 which is 0.0000001 molar, pretty darn small. Remove one of the zeros and you die from acidosis, add a zero and you die from excess alkalinity. Normal pH is about 7.35, which corresponds to a molar concentration of about 0.000000044 moles per litre of hydrogen ion.

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