When you mention "Gallic acid for standard," it could refer to using gallic acid as a standard substance or reference material in analytical and laboratory procedures. In analytical chemistry, standard solutions are used to calibrate instruments, validate methods, and determine the concentration of substances in samples. Gallic acid is sometimes employed as a standard or reference substance for specific purposes, such as in the quantification of polyphenols or other chemical compounds. Here's how gallic acid might be used as a standard: