terms:ph
An expression representing the negative logarithm of the effective hydrogen-ion concentration or hydrogen-ion activity (in gram equivalents per liter). The pH value is a unit of measure of the acid or alkaline condition of a substance. A neutral solution (as pure water) has a pH of 7; acid solutions are less than 7; basic, or alkaline solutions are above 7. The pH scale is a logarithmic scale; a substance with a pH of 4 is more than twice as acid as a substance with a pH of 5. Similarly, a substance with a pH of 9 is much more than twice as alkaline as a substance with a pH of 8.
terms/ph.txt · Last modified: 2023/11/22 08:42 by 127.0.0.1