CALCIUM HYDRIDE
- CAS No.
- 7789-78-8
- Chemical Name:
- CALCIUM HYDRIDE
- Synonyms
- CaH2;Hydrolete;Hydrolith;cium hydride;Cakium hydride;CALCIUM HYDRIDE;Dihydridecalcium;Calciumhydridemm;Calciumhydride,95%;Calciumhydridemesh
- CBNumber:
- CB0115234
- Molecular Formula:
- CaH2
- Molecular Weight:
- 42.09
- MOL File:
- 7789-78-8.mol
- Modify Date:
- 2024/10/31 13:32:20
| Melting point | 816 °C (lit.) |
|---|---|
| Density | 1.9 |
| storage temp. | Store below +30°C. |
| solubility | reacts with H2O, ethanol |
| form | powder |
| color | Light gray |
| Specific Gravity | 1.9 |
| Water Solubility | Soluble in water and alcohol. Insoluble in benzene. |
| Sensitive | Moisture Sensitive |
| Merck | 14,1672 |
| Stability | 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 DataBase Reference | 7789-78-8(CAS DataBase Reference) |
| NIST Chemistry Reference | calcium hydride(7789-78-8) |
| EPA Substance Registry System | Calcium hydride (CaH2) (7789-78-8) |
SAFETY
Risk and Safety Statements
| Symbol(GHS) |   GHS02,GHS07 |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Signal word | Danger | |||||||||
| Hazard statements | H260-H315-H319 | |||||||||
| Precautionary statements | P223-P231+P232-P264-P280-P302+P352-P305+P351+P338 | |||||||||
| Hazard Codes | F | |||||||||
| Risk Statements | 15 | |||||||||
| Safety Statements | 24/25-43-7/8-43A | |||||||||
| RIDADR | UN 1404 4.3/PG 1 | |||||||||
| WGK Germany | 1 | |||||||||
| TSCA | Yes | |||||||||
| HazardClass | 4.3 | |||||||||
| PackingGroup | I | |||||||||
| HS Code | 28500090 | |||||||||
| NFPA 704 |
|
CALCIUM HYDRIDE price More Price(23)
| Manufacturer | Product number | Product description | CAS number | Packaging | Price | Updated | Buy |
|---|---|---|---|---|---|---|---|
| Sigma-Aldrich(India) | 497355 | Calcium hydride powder, 99.99% trace metals basis | 7789-78-8 | 2G | ₹14624.58 | 2022-06-14 | Buy |
| Sigma-Aldrich(India) | 558257 | Calcium hydride 99.9% trace metals basis | 7789-78-8 | 10G | ₹27538.8 | 2022-06-14 | Buy |
| Sigma-Aldrich(India) | 497355 | Calcium hydride powder, 99.99% trace metals basis | 7789-78-8 | 10G | ₹53605.4 | 2022-06-14 | Buy |
| Sigma-Aldrich(India) | 213268 | Calcium hydride powder, 0-2?mm, reagent grade, ≥90% (gas-volumetric) | 7789-78-8 | 100G | ₹7274.4 | 2022-06-14 | Buy |
| Sigma-Aldrich(India) | 21170 | Calcium hydride purum p.a., ≥97.0% (gas-volumetric), powder | 7789-78-8 | 25G | ₹7241.93 | 2022-06-14 | Buy |
CALCIUM HYDRIDE Chemical Properties,Uses,Production
Description
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.
Chemical Properties
Pure calcium hydride crystallizes in the form of colorless, hexagonal prisms, but the industrial product contains some calcium metal and is consequently gray. On heating, calcium hydride decomposes without melting. In keeping with its salt-like character it is insoluble in inert solvents but dissolves in molten LiCl – KCl eutectic mixtures (352℃). Calcium hydride can be safely handled in air, but is slowly attacked and crumbles to powder if the air is moist. It reacts with dry oxygen or nitrogen if heated above 500℃, forming the oxide or nitride, respectively.
Physical properties
Grayish orthorhombic crystal or powder; stable at ambient temperature; density 1.70 g/cm3; melts at 816°C; reacts with water and alcohol.
Uses
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.
Production Methods
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.
Preparation
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.
Reactions
Once
ignited, it burns with a strongly exothermic reaction:
CaH2+O2→CaO+H2O
The reaction of calcium hydride with water is
also very exothermic. Heating is necessary to
initiate the reaction with alcohols to form alcoholates. The reaction with ammonia takes place
at 700 ℃ with formation of calcium amide. At
high temperature (600 – 1000℃) calcium
hydride is a powerful reducing agent.
General Description
Grayish-colored lump or crystalline solid. Irritating to skin and eyes. Used to make other chemicals.
Air & Water Reactions
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].
Reactivity Profile
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).
Hazard
Evolves highly flammable hydrogen when wet; solid product is slaked lime. Irritating to skin.
Health Hazard
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.
Fire Hazard
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.
CALCIUM HYDRIDE Preparation Products And Raw materials
Raw materials
Preparation Products
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chevron_right| Supplier | Tel | Country | ProdList | Advantage | Inquiry |
|---|---|---|---|---|---|
| JSK Chemicals | +919879767970 | Gujarat, India | 3753 | 58 | Inquiry |
| Otto Chemie Pvt. Ltd. | +91 9820041841 | Mumbai, India | 5870 | 58 | Inquiry |
| Alfa Aesar | 1 800 209 7001 | Maharashtra, India | 6905 | 58 | Inquiry |
| Triveni chemicals | 08048762458 | New Delhi, India | 6088 | 58 | Inquiry |
| Aritech Chemazone Private Limited | +91-9034345475 | Punjab, India | 684 | 58 | Inquiry |
| Central Drug House(P) Ltd. | 91-11-49404040 | New Delhi, India | 6157 | 58 | Inquiry |
| Ultra Pure Lab Chem Industries LLP | 08046077962 | Mumbai, India | 252 | 58 | Inquiry |
| Million Link India Smelting Private Limited | 09968444400 | Punjab, India | 1 | 58 | Inquiry |
| Sood Chemicals | 08048361240Ext 585 | Haryana, India | 65 | 58 | Inquiry |
| Scientific Syndicate | 08046043822 | Hyderabad, India | 17 | 58 | Inquiry |
| Supplier | Advantage |
|---|---|
| JSK Chemicals | 58 |
| Otto Chemie Pvt. Ltd. | 58 |
| Alfa Aesar | 58 |
| Triveni chemicals | 58 |
| Aritech Chemazone Private Limited | 58 |
| Central Drug House(P) Ltd. | 58 |
| Ultra Pure Lab Chem Industries LLP | 58 |
| Million Link India Smelting Private Limited | 58 |
| Sood Chemicals | 58 |
| Scientific Syndicate | 58 |
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