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pH Measures the acidity of a solution. It is the negative logarithm of the concentration of the hydrogen ions in a substance. If the hydrogen ion concentration of a solution is 1x10-n mol litre-1, then the pH of the solution is n. The lower the pH, the more acid the solution. A pH of 7 corresponds to a neutral solution. | pH | | | 0 | | | | hydrochloric acid, sulphuric acid | | 1 | stomach acid | | | | | 2 | battery acid | | | | | 3 | vinegar | | | lemon juice | | 4 | tomato juice | | | | | 5 | acid rain, black coffee | | | human skin | | 6 | | | | saliva, milk | | 7 | distilled water | | | blood | | 8 | seawater | | | | | 9 | baking soda | | | soap | | 10 | | | | | | 11 | domestic bleach | | | milk of magnesia | | 12 | | | | | | 13 | | | | caustic soda | | 14 | |
See also: Acid, Acid-Base Indicator, Alkaline, Base, Logarithm, pOH, Universal Indicator.
  
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