无色结晶或白色颗粒。有吸湿性。当含有充分水分后(16.36%)不吸湿。易溶于水，几乎不溶于乙醇。水溶液呈强碱性。有刺激性。
熔点       891 °C  
敏感性   Hygroscopic 
Merck   14,7670

AR / CP  /  PT
Q/(GH)SJ476-92
项目ltem                                                                      分析纯　　　　　         化学纯
　　　　　　　　　　　　　　　　　　　           (AR)                                 (CP)
含量(K2CO3•3/2H2O)Assay,%                                  99.0～100.2　　            98.0～100.5
水不溶物lnsoluble matter in water,%                        ≤0.005                            0.02
氯化物及氯酸盐(以Cl计)Chloride  and
chlotate,%                                                                    ≤0.001                            0.005
硫化合物(以SO4计)Sulfur compounds,%                  ≤0.002                             0.005
氮化合物(N)Nitrogen compounds,%                          ≤0.005                              0.005
钙及镁(Ca+Mg)Calcium and magnesium,%              ≤0.01                                 0.05
铁(Fe)Iron,%                                                                ≤0.0005                              0.001
砷(As)Arsenic,%                                                           ≤0.00003                            0.00003
重金属(以Pb计)Heavy metals,%                                 ≤0.0003                            0.0003
磷酸盐(PO4)Phosphate,%                                            ≤0.003                               0.01
硅酸盐及氨沉淀物Silicate and substan-
ces precipitatde by ammonia solution,%                      ≤0.005                               0.003

危险品标志         Xn 
危险类别码        22-36/38 
安全说明            26 
WGK Germany  1
F                          3 

用作分析试剂。钾盐制备
密封保存