pH meter - acidity/alkalinity measurement by LCD

pH meter elektor march 1985 Determining the pH value of an aqueous solution is one of the more important measurements in inorganic chemistry. Any connection with electronics seems remote, and yet chemists have made use of electronics in pH measurements for years. They do this with a special sensor which enables the degree of acidity or alkalinity to be displayed analogously or digitally. Until recently these sensors were prohibitively expensive for hobbyists, but as prices have been coming down, we decided to design a pH meter which will be particularly appreciated by aquarium owners. pH meter acidity/alkalinity measurement by LCD As most electronic hobbyists are no chemists, we will keep "chemistry" to an absolute minimum. Each aqueous solution has a certain measure of acidity or alkalinity, which is dependent on the concentration of hydrogen-ions in it. The higher the con- centration, the higher the acidity, and the lower the pH. When the concentration is low (very few hydrogen-...