Such tests number more than 700 a day. Following is a look at some of the things we look at to assure quality. Measurement pH is an expression of acidity or alkalinity of a solution. It is measured on a scale of 1 to 14. Acids have a pH of 1 to 7,the lower the number, the stronger the acid.
Some acids are weak like vinegar and some are strong like sulfuric acid.
Bases have a pH of 7 to 14, the higher the number, the stronger the base. Bases can be weak like milk of magnesia or strong like some oven cleaners. Water is neutral, therefore it has a pH of 7. From a chemical point of view, pH is a measure of hydrogen ion activity. It is based on a log base 10 scale.