Low to high pH stomach acid> urine> blood.
In a solution, it is a measure of hydrogen ion concentration. As a result, to determine acidity or alkalinity of a solution.
The normal range of pH scale is from 0 to 14. In an aqueous solution at 25°C, if the pH less than 7 are acidic, while those with a pH greater than 7 are basic or alkaline.
The normal blood pH for adult humans is 7.40, and this pH value is vigorously defended at normal body temperature. The normal the pH of stomach acid is acidic (1.5 to 3.5).
The normal range for urine pH is 4.5 to 7.8. Very alkaline urine (pH > 7.0) is suggestive of infection with a urea-splitting organism, such as Proteus mirabilis.
Prolonged storage can lead to overgrowth of urea-splitting bacteria and a high urine pH.
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