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Chromium(III) potassium sulfate dodecahydrate

Cas:
7788-99-0
Molecular Structure:
MDL:
MFCD00149917
Molecular Formula:
CrKO8S2.12H2O; CrK(SO4)2•12H2O
Molecular Weight:
499.40
Alias:
硫酸钾铬,铬矾,铬明矾,钾铬矾 Chrome alum Potassium chromium(III) sulfate dodecahydrate
Product order:
Name Specifications Packing Price Delivery
Chromium(III) potassium sulfate dodecahydrate AR 500g RMB 74.8 Consulting service
Chromium(III) potassium sulfate dodecahydrate CP 500g RMB 66 Consulting service
Chromium(III) potassium sulfate dodecahydrate ACS 500g RMB 88 Consulting service
Character:
紫红色到黑色八面立方大结晶块,易风化。在透射光下呈宝石红色,加热到100ºC失去部分结晶水而变绿色,110℃时得二水物,350℃时变成无水物呈浅黄绿色,并失去水溶性。溶于水和稀酸,不溶于醇,能溶于4份冷水、2份沸水,几乎不溶于醇。其水溶液冷时呈紫色,热时呈绿色。
熔点:89℃
Quality Standard:
Q/(HG)SJ766-1998 HG3-916-76
项目ltem                             分析纯      化学纯
                    (AR)              (CP)
含量Assay,%                          ≥99.5              99.0
水不溶物lnsoluble matter in water,%  ≤0.005             0.01
氯化物(Cl)Chloride,%                 ≤0.002             0.005
铵盐(NH4),%                          ≤0.01              0.03
铝(AL)ALuminum,%                     ≤0.02              0.05
铁(Fe)Iron,%                         ≤0.005             0.02
重金属(以Pb计)Heavy metals,%         ≤0.002             0.01

ACS级
项目名称                          ACS Grade
含量Assay                             98.0-102.0%
氯化物(Cl)Chloride                   ≤0.002%
铝(Al)Aluminum                       ≤0.02%
铁(Fe)Iron                           ≤0.01%
铵盐(NH4)Ammonium                    ≤0.01%
重金属(以Pb计)Heavy metals(as Pb)    ≤0.01%

Storage:
密封保存。
显微分析用固着剂,皮革,制备其他铬盐。
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