What is the purpose of an alkaline buffer in an alakline phosphatase ay?

alakline phosphatase will work optimumly at a alkaline pH. pH is a negative log measurment of H+ ions the greater the pH fewer number of H+ ions, if enzymes are out of there optimum range they will either donate or uptake H+ this change in the structure will cahnge the enzymes active site and the enzyme will not be able to catalyze reactions