Sigma-Aldrich 25022 Sodium acetate trihydrate puriss., meets analytical specification of Ph. Eur., BP, USP, FCC, E262, 99.0-101.0% (calc. to the dried substance), ≤0.00002% Al Linear Formula: CH3COONa · 3H2O CAS Number: 6131-90-4 Molecular Weight: 136.08