无水碳酸钠

等级

ACS reagent
anhydrous

质量水平

200

Agency

suitable for SM 4500 - NH3

检测方案

≥99.5%

形式

powder or granules

杂质

≤0.005% silica
≤0.01% insolubles

缺失

≤1.0% loss on heating, 285 °C

pH值（酸碱度）

12 (25 °C, 106 g/L)

mp

851 °C (lit.)

痕量阴离子

chloride (Cl-): ≤0.001%
phosphate (PO43-): ≤0.001%
sulfur compounds (as SO42-): ≤0.003%

痕量阳离子

Ca: ≤0.03%
Fe: ≤5 ppm
K: ≤0.005%
Mg: ≤0.005%
heavy metals: ≤5 ppm (by ICP-OES)