Chromium Chloride - Encachrome

[ I ] Chromium(II) chloride: CrCl ₂ (122.90). Also called chromium dichloride. The anhydrous form is obtained by direct reaction of heated chromium metal with hydrogen chloride, or by passing hydrogen through heated chromium(III) chloride. Colorless needle crystals. Melting point: 824 °C. Easily soluble in water. The hexahydrate, tetrahydrate, trihydrate, and dihydrate are obtained from the aqueous solution. The anhydrous form is stable in dry air, but is easily oxidized in moist air. A strong reducing agent. Used in chromium metallurgy and as a reducing agent and catalyst in organic reactions. Toxic. [CAS 10049-05-5] [ II ] Chromium(III) chloride: CrCl ₃ (158.36). Also called chromium trichloride. The anhydrous form is obtained by passing chlorine through heated chromium metal, or through chromium(III) oxide mixed with carbon. The anhydride is a reddish purple crystal with a melting point of 1150 °C and decomposes at temperatures above 1200 °C. It is poorly soluble in water. The hydrate can be obtained by dissolving chromium hydroxide (III) in hydrochloric acid or from an aqueous solution obtained by reducing potassium dichromate with concentrated hydrochloric acid. Both hydrates are readily soluble in water. It is used as a catalyst for organic reactions, in plating, in pharmaceuticals, as a pigment, as a mordant, and in leather tanning (chrome tanning). It is toxic. [CAS 10025-73-7: CrCl ₃ ][CAS 10060-12-5: CrCl ₃ ･6H ₂ O]

Source: Morikita Publishing "Chemical Dictionary (2nd Edition)" Information about the Chemical Dictionary 2nd Edition

【Ⅰ】塩化クロム(Ⅱ)：CrCl₂(122.90)．二塩化クロムともいう．加熱した金属クロムと塩化水素の直接反応，または加熱した塩化クロム(Ⅲ)に水素を通じると無水物が得られる．無色の針状晶．融点824 ℃．水に易溶．水溶液からは六水和物，四水和物，三水和物，二水和物が得られる．無水物は乾燥した空気中では安定であるが，湿った空気中では容易に酸化される．強い還元剤である．クロムの冶金，有機反応の還元剤や触媒に用いられる．有毒．[CAS 10049-05-5]【Ⅱ】塩化クロム(Ⅲ)：CrCl₃(158.36)．三塩化クロムともいう．加熱した金属クロムに塩素を通じるか，または炭素を混合した酸化クロム(Ⅲ)に塩素を通じると無水物が得られる．無水物は，赤紫色の結晶で，融点1150 ℃，1200 ℃ 以上では分解する．水に難溶．水和物は水酸化クロム(Ⅲ)を塩酸に溶かしたり，二クロム酸カリウムを濃塩酸で還元した水溶液などから得られる．水和物はいずれも水に易溶．有機反応の触媒，めっき，医薬品，顔料，媒染剤，皮なめし(クロムなめし)などに用いられる．有毒．[CAS 10025-73-7:CrCl₃][CAS 10060-12-5:CrCl₃･6H₂O]

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