Tris Base, ULTROL® Grade tris(Hydroxymethyl)aminomethane Useful in the pH range of 7.0-9.0. Has a pKa of 8.1 at 25°C. Absorbance (1.0 M, H2O, 260 nm): <0.05. 产品信息 Form White crystalline solid Molar mass 121.1 Purity ≥99% by titration (dry basis) Heavy metals ≤5 ppm pH value (1.0 M, H2O): 9.5 - 11 PKA 8.3 at 20°C Solubility H2O Chemical formula C4H11NO3 RTECS TY2900000 CAS number 77-86-1 Merck USA index 14, 9772 商店和运输信息 Storage +15°C to +30°C Ship Ambient Temperature Only Irritant
