The pH range between 0.5 and 2.5 is optimal for the activity of pepsin, a common enzyme present in the stomach.
What pH would the enzyme work best at?
Around pH 6 to 8, many enzymes found in higher species function quite effectively.
But there are lots of exceptions. Alkaline phosphatase is most effective at a pH range of 8.5 to 9.5, although some enzymes, such pepsin, function well at a pH range of 1.5 to 2.
The pH range between 0.5 and 2.5 is optimal for the activity of pepsin, a common enzyme present in the stomach.
The ideal pH is where enzyme activity is highest. Enzyme activity declines as pH values rise above or fall below the ideal pH range.