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The measure of acidity of a substance is known as pH. Pure water, which has pH of 7, is neutral. Substances with a pH less than 7 are considered acidic and substances with a pH of greater than 7 are considered basic.
The normal pH of blood running through arteries (large elastic-walled blood vessels that carry blood from the heart to other parts of the body) is 7.4; the pH of blood in the veins (vessels that transports blood to the heart) is about 7.35. Normal urine pH averages about 6.0. Saliva has a pH between 6.0 and 7.4.
Source: Guyton, Arthur C. Textbook of Medical Physiology, 8th ed., pp. 331, 340, 711.
according to the BINAS (a dutch book with tables, graphics and lists of all sort of things regarding Biology, physics and chemistry), the pH range of blood is 7,3 - 7,5, the pH range of urine is 4.8 - 8,4 and the pH range of salivia is 6,5 - 7,5.
The pH range of blood should be between 7,33 and 7,42 to be considdered healthy (and to stay alive) so it's being kept that way by the use of natural buffer solution in your body
saliva- between 6.2 and 7.4
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