AVA Chemicals [P] Ltd. Offers LR Grade Ammonium Acetate. AVA Chemicals [P] Ltd. Is an ISO 9001:2000 certified company which manufactures a wide range of chelating and sequestering agents and fine chemicals. The chemical formula of the LR Grade Ammonium Acetate is CH3COO NH4 and the CAS Numbers are 631-61-8. Molecular Weight of LR Grade Ammonium Acetate is 77.08. It is a colorless Hygroscopic Crystals with an assay of minimum 98 %. LR Grade Ammonium Acetate measures 6.5 to 7.5 in pH rating scale.