grade standard reagent grade, technical grade physical state powder usage industrial, commerical purity 98% pentetic acid or diethylenetriaminepentaacetic acid is an aminopolycarboxylic acid consisting of a diethylenetriamine backbone with five carboxymethyl groups. The molecule can be viewed as an expanded version of edta and is used similarly.formula: c14h23n3o10solubility in water: