B5887 SIGMA-ALDRICH Sodium butyrate ≥98.5% (GC) Synonym: Butyric acid sodium salt CAS Number 156-54-7 Linear Formula CH3CH2CH2COONa Molecular Weight 110.09 Appearance (Color) White Appearance (Form) Powder Solubility (Color) Colorless Solubility (Turbidity) Clear to Slightly Hazy 100 mg/ml in H2O Water (by Karl Fischer) < 3.0 % _ Purity (GC) > 98.5 % _ Recommended Retest Period ------------------------- 4 years Carbon (anhydrous) 42.80 - 44.50 % Sodium (anhydrous) 19.8 - 22.0 %