PH is a measure of hydrogen ion concentration; a measure of acidity or alkalinity of a solution. The pH scale usually ranges from 0-14. Aqueous solutions at 25C with a pH less than seven are acidic, while those with a pH greater than seven are basic or alkaline. A pH level of 7.0 at 25C I’ds defines as ‘Neutral’. Very strong acids may have a negative pH, while very strong bases may have a pH greater than 14.
Examples of pH values of common chemicals
we work with many acids (low pH0 and bases (high pH) every day. Examples of pH values of lab chemicals and household products include:
0 – hydrochloride acid
2.0 – lemon juice
2.2 – vinegar
4.0 – wine
7.0 – pure water (Neutral)
7.4 – human blood
13.0 – lye
14.0 sodium hydroxide
Not all liquids have a pH value, pH only has meaning in an aqueous solution (in water). Meny chemicals, including liquids, do not have pH values. If there’s no water there’s no pH! For example, there is no pH value for vegetable oil, gasoline, or pure alcohol. pH is used in everyday life as well as science and industry. It is used in cooking, to design cocktails, in cleaners, and in food preservation.