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수소화칼슘

수소화칼슘
수소화칼슘 구조식 이미지
카스 번호:
7789-78-8
한글명:
수소화칼슘
동의어(한글):
디수화칼슘;수소화칼슘;수화칼슘;수화칼슘(CAH2);하이드라이드칼슘;히드로리트;디수화칼슘;하이드로리트;수소화칼슘;칼슘 수소화물
상품명:
CALCIUM HYDRIDE
동의어(영문):
CaH2;Hydrolete;Hydrolith;cium hydride;Cakium hydride;CALCIUM HYDRIDE;Dihydridecalcium;Calciumhydridemm;Calciumhydridemesh;Calciumhydride,95%
CBNumber:
CB0115234
분자식:
CaH2
포뮬러 무게:
42.09
MOL 파일:
7789-78-8.mol

수소화칼슘 속성

녹는점
816 °C (lit.)
밀도
1.9
저장 조건
Store below +30°C.
물리적 상태
powder
색상
Light gray
Specific Gravity
1.9
수용성
Soluble in water and alcohol. Insoluble in benzene.
감도
Moisture Sensitive
Merck
14,1672
안정성
Stable, but reacts violently with water, liberating and igniting hydrogen. Contact with strong oxidizers may cause fire or explosion. Incompatible with strong oxidizing agents, strong acids, halogens, water, alcohols.
InChIKey
FAQLAUHZSGTTLN-UHFFFAOYSA-N
CAS 데이터베이스
7789-78-8(CAS DataBase Reference)
NIST
calcium hydride(7789-78-8)
EPA
Calcium hydride (CaH2) (7789-78-8)
안전
  • 위험 및 안전 성명
  • 위험 및 사전주의 사항 (GHS)
위험품 표기 F
위험 카페고리 넘버 15
안전지침서 24/25-43-7/8-43A
유엔번호(UN No.) UN 1404 4.3/PG 1
WGK 독일 1
TSCA Yes
위험 등급 4.3
포장분류 I
HS 번호 28500090
유해 물질 데이터 7789-78-8(Hazardous Substances Data)
기존화학 물질 KE-04553
그림문자(GHS):
신호 어: Danger
유해·위험 문구:
암호 유해·위험 문구 위험 등급 범주 신호 어 그림 문자 P- 코드
H260 물과 접촉시 자연 발화성 인화성 가스를 발생시킴 물반응성 물질 및 혼합물 구분 1 위험 P223, P231+P232, P280, P335+ P334,P370+P378, P402+P404, P501
예방조치문구:
P223 물과 접촉하지 마시오.
P231+P232 불활성 기체 하에서 취급하고, 습기를 방지하시오.
P370+P378 화재 시 불을 끄기 위해 (Section 5. 폭발, 화재시 대처방법의 적절한 소화제)을(를) 사용하시오.
P402+P404 건조한 장소에 보관하시오. 밀폐된 용기에 보관하시오.

수소화칼슘 C화학적 특성, 용도, 생산

개요

Calcium hydride is a gray powder (white if pure, which is rare). It reacts vigorously with water liberating H2 gas. CaH2 is thus used as a drying agent, i.e. a desiccant. It is prepared directly from the metal or by reacting CaCO3 with hydrogen at elevated temperatures. The overall reaction is shown as follows:
CaCO3+heat+H2→CaH2+H2O+CO2
CaH2 is a saline hydride, meaning that its structure is salt-like. The alkali metals and the alkaline earth metals all form saline hydrides. These species are insoluble in all solvents with which they do not react because they have extended structures. CaH2 crystallizes in the PbCl2 structural pattern.
The reaction of CaH2 with water can be represented as follows:
CaH2+2H2O0Ca(OH)2+2H2
The two hydrolysis products, H2, a gas, and Ca(OH)2, an aqueous mixture of solid plus liquid (i.e. a slurry), are readily separated from the solvent by distillation, filtration, or decantation.

화학적 성질

greyish-white solid

물리적 성질

Grayish orthorhombic crystal or powder; stable at ambient temperature; density 1.70 g/cm3; melts at 816°C; reacts with water and alcohol.

용도

Calcium hydride is used as an efficient drying agent for aprotic base-stable solvents like ethers and tertiary amines. It is a useful dehydrating agent in a synthesis of aldehyde enamines in high yield and purity.

용도

Calcium hydride is a relatively mild desiccant. It is safer than the more reactive agents such as sodium metal. Calcium hydride is widely used as a desiccant for basic solvents such as amines and pyridine in organic syntheses. It is also used to pre-dry solvents prior to the use of a more reactive desiccant. The compound has, however, been widely used for decades as a safe and convenient means to inflate weather balloons. Likewise, it is regularly used in laboratories to produce small quantities of highly pure hydrogen for experiments.

용도

To prepare rare metals by reduction of their oxides; as a drying agent for liquids and gases; to generate hydrogen: 1 g of calcium hydride in water liberates 1 liter of hydrogen at STP; in organic syntheses.

제조 방법

Calcium hydride may be prepared from its elements by direct combination of calcium and hydrogen at 300 to 400°C. It also can be made by heating calcium chloride with hydrogen in the presence of sodium metal:
CaCl2 + H2 + 2Na → CaH2 + NaCl
Alternatively, calcium hydride may be prepared by the reduction of calcium oxide with magnesium in the presence of hydrogen:
CaO + Mg + H2 → CaH2 + MgO.

생산 방법

Calcium hydride ignites in air on heating and can explode violently if mixed and rubbed with a strong oxidizing agent such as perchlorate or bromate. Contact with water produces hydrogen which can create a fire hazard in a confined space.

일반 설명

Grayish-colored lump or crystalline solid. Irritating to skin and eyes. Used to make other chemicals.

공기와 물의 반응

Ignites in air or reacts violently, sometimes explosively, with air of high humidity [Bretherick 1979 p. 107]. Reacts exothermically with water to generate flammable hydrogen gas and calcium hydroxide, a base. [Merck, 11th ed. 1989].

반응 프로필

When silver fluoride is ground with CALCIUM HYDRIDE the mass becomes incandescent [Mellor 3:389 1946-47]. Heating the hydride strongly with chlorine, bromine, or iodine leads to incandescence. Mixtures of the hydride with various bromates, i.e. barium bromate; chlorates, i.e. barium chlorate, and perchlorates, i.e. potassium perchlorate; explode on grinding, [Mellor, 1946, vol. 3, 651]. CaH2 reacts incandescently with AgF if subject to friction. (Mellor, 1941, Vol. 3, 389, 651).

위험도

Evolves highly flammable hydrogen when wet; solid product is slaked lime. Irritating to skin.

건강위험

Inhalation or contact with vapors, substance or decomposition products may cause severe injury or death. May produce corrosive solutions on contact with water. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control may cause pollution.

화재위험

Produce flammable gases on contact with water. May ignite on contact with water or moist air. Some react vigorously or explosively on contact with water. May be ignited by heat, sparks or flames. May re-ignite after fire is extinguished. Some are transported in highly flammable liquids. Runoff may create fire or explosion hazard.

수소화칼슘 준비 용품 및 원자재

원자재

준비 용품


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