Chem Explorers

The Power of Calcium Hydride: Properties Uses and Safety Precautions

Calcium Hydride: Properties, Preparation, and Uses

Calcium hydride is a chemical compound made up of calcium and hydrogen, with the chemical formula CaH2. It is a grayish-white powder that reacts vigorously with water, releasing hydrogen gas.

This article provides an overview of calcium hydride, including its properties, preparation, and uses.

Properties of Calcium Hydride

When calcium metal reacts with hydrogen gas, it forms calcium hydride, a compound that has a melting point of 816°C and a boiling point of 1204°C. Calcium hydride is denser than water, with a density of 1.70 g/cm3.

It is relatively stable under normal conditions, but when it comes into contact with water, it reacts violently, releasing hydrogen gas.

Molecular Structure of Calcium Hydride

The molecular structure of calcium hydride consists of a lattice of calcium ions, each of which is surrounded by six hydride ions. The hydride ions have a tetrahedral arrangement around the calcium ion, with two hydrogen atoms bonded to each hydride ion.

Preparation of Calcium Hydride

Calcium hydride is commonly prepared by the reaction between calcium metal and hydrogen gas. The reaction is exothermic and must be carried out in an inert atmosphere to avoid oxidation of the calcium metal.

The reaction is as follows:

Ca + H2 → CaH2

The reaction is usually conducted at high temperatures, typically between 300-500°C. The use of a reducing agent, such as magnesium, can also help to reduce the reaction temperature.

Uses of Calcium Hydride

Calcium hydride is widely used in various industries due to its unique properties. One common use for calcium hydride is as a drying agent.

It reacts with moisture to form calcium hydroxide and hydrogen gas. This reaction effectively removes any water present in the system, making it useful for drying solvents or gases.

Another use for calcium hydride is in the production of hydrogen gas. When calcium hydride reacts with water, hydrogen gas is released, making it a source of pure hydrogen.

This reaction is often used as a backup source of hydrogen in fuel cells and other hydrogen-powered technologies. Calcium hydride is also used in the production of metal hydrides.

Metal hydrides are a type of compound that consists of a metal ion and one or more hydride ions. Calcium hydride can be used to produce other metal hydrides by reacting with a metal chloride in the presence of a suitable reducing agent.

The resulting metal hydride can be used in a variety of applications, such as hydrogen storage and battery electrodes.

Conclusion

In conclusion, calcium hydride is a unique compound that has a wide range of applications. Its properties and molecular structure make it ideal for use as a drying agent, hydrogen source, and metal hydride precursor.

The preparation of calcium hydride involves the reaction between calcium metal and hydrogen gas, typically carried out at high temperatures. Overall, calcium hydride is an important compound that is widely used in the chemical, pharmaceutical, and energy industries.

Calcium Hydride: Properties and Uses

Calcium hydride is a chemical compound that is made up of calcium and hydrogen atoms, with the chemical formula CaH2. It is a white to grayish powder that is mainly used as a desiccant and as a source of hydrogen gas.

This article provides an in-depth discussion of the properties and uses of calcium hydride.

Physical Properties of Calcium Hydride

Calcium hydride appears as a white to grayish powder.

It possesses a peculiar odor and has a molar mass of 42.09 g/mol. It is soluble in hot water (with hydrolysis), but insoluble in cold water.

Calcium hydride has a specific gravity of 1.70. It has a melting point of 816°C and a boiling point of 1204°C.

These characteristics make it an ideal compound for various applications.

Chemical Properties of Calcium Hydride

Calcium hydride has unique chemical properties, including its ability to react with hydrogen to produce hydrogen gas.

Calcium hydride is a salt-like compound that has a tetragonal crystal structure. It has a high melting point, and even under high pressure, it does not undergo any phase change.

Calcium hydride is a relatively stable compound under normal conditions but becomes unstable when exposed to water, oxygen, or air. Calcium hydride can react easily with water to form calcium hydroxide and hydrogen gas.

Uses of Calcium Hydride

As a desiccant

One significant use of calcium hydride is as a desiccant. It is commonly used in laboratories and industries for drying organic solvents, hydrocarbons, and gases.

Calcium hydride can absorb water molecules through hydrolysis and convert them to calcium hydroxide. This reaction also releases hydrogen gas, which can be filtered off.

Calcium hydride is a mild desiccant that does not cause chemical reaction with organic molecules and is safe to handle. The resulting calcium hydroxide can also be disposed of easily.

For Hydrogen Production

Calcium hydride is an excellent source of hydrogen gas. When it reacts with water, it releases pure hydrogen gas without any harmful byproducts.

Calcium hydride is used as a hydrogen source in many applications, including fuel cells, combustion engines, and laboratories. Calcium hydride is an ideal reducing agent due to its high stability and reactivity towards water.

Disadvantages of Calcium Hydride

While calcium hydride has many benefits, it also has its disadvantages. One significant concern is that calcium hydride reacts very slowly with water at room temperature.

This can cause it to be incompatible with certain applications that require a quick or immediate release of hydrogen. Additionally, calcium hydride is incompatible with certain chemicals, and improper handling can cause accidents.

Lastly, calcium hydride is unable to store large amounts of hydrogen gas.

In conclusion, calcium hydride is a versatile chemical compound with unique properties that make it useful for a variety of industrial and research applications.

It is an excellent source of hydrogen gas and an efficient and safe desiccant. However, it also has some limitations such as slow reaction times and potential incompatibility with other chemicals.

Overall, calcium hydride is a valuable compound that is widely used and appreciated in the scientific community.

Calcium Hydride: Material Safety Data Sheet (MSDS) and Availability

Calcium hydride is a chemical compound that is mainly used as a desiccant and as a source of hydrogen gas.

While it has many benefits, it is also important to be aware of the potential hazards and precautions associated with the handling of this compound. In this article, we will discuss the Material Safety Data Sheet (MSDS) of calcium hydride and its availability, including the suppliers and uses in industries.

Material Safety Data Sheet (MSDS) of Calcium Hydride

Toxicology

Calcium hydride can be harmful if proper precautions are not taken while handling it. Inhalation of its dust can cause respiratory tract irritation.

Ingestion of calcium hydride can lead to the formation of hydrogen gas in the stomach, leading to gas embolism. Eye contact with calcium hydride powder may cause irritation, while skin contact with the powder can cause burns.

Prolonged exposure can result in chronic health effects.

First Aid Measures

If eye contact occurs, it should be washed thoroughly with water for at least 15 minutes and medical attention should be sought. In case of skin contact, the affected area should be rinsed with water.

If calcium hydride is inhaled, the affected person should be removed from the area to fresh air. Artificial respiration should be given if the person is not breathing normally.

Ingestion of calcium hydride requires immediate medical attention.

Personal Safety Measures

When handling calcium hydride, personal protective equipment (PPE) must be worn. Splash goggles and protective gloves should be used to avoid eye and skin contact with the compound.

A dust respirator must be used to avoid inhaling the dust. Loose clothing must be avoided.

Fire Fighting Measures

Calcium hydride is not flammable; however, it reacts with water, releasing hydrogen gas, which is flammable. Fire fighting gear must be worn, and calcium hydride must be kept away from any sources of ignition.

In case of a fire, dry sand, sodium chloride, or sodium carbonate can be used to put out the fire.

Availability of Calcium Hydride

Suppliers

Calcium hydride is available from various reputable companies, including Sigma-Aldrich, Alfa Aesar, and Chem-Supply. These companies offer calcium hydride in a variety of quantities and grades, ensuring that customers can find the right product for their needs.

Online stores such as Amazon, eBay, and Alibaba also have a selection of calcium hydride.

Uses in Industries

Calcium hydride is widely used in industries, including the chemical, pharmaceutical, and energy industries. It is best known for its use as a desiccant, where it is used to remove moisture from various substances, including solvents and gases.

Calcium hydride is also used as a source of hydrogen gas, and its reaction with water to yield hydrogen gas is exploited in fuel cell technology. It plays a vital role in the synthesis of various metal hydrides, used for hydrogen storage, and drug delivery systems.

Conclusion

In conclusion, calcium hydride is a versatile compound with numerous applications in industries. It is an efficient source of hydrogen gas and a safe and effective desiccant.

Its MSDS must be taken into consideration when handling, and appropriate precautions must be taken to ensure personal and environmental safety. The availability of calcium hydride from various suppliers ensures that customers can easily procure it for their personal and business needs.

This article discussed the properties, preparation, uses, MSDS, and availability of calcium hydride. Its unique properties make it suitable for applications in industries such as chemical, pharmaceutical, and energy.

However, its handling requires appropriate caution and protective gear to avoid its harmful effects. Calcium hydride is mainly used as a desiccant and source of hydrogen gas.

It is available from various reputable suppliers online.

FAQs:

1. What is calcium hydride?

Calcium hydride is a chemical compound made up of calcium and hydrogen atoms, with the chemical formula CaH2.

2. What are the properties of calcium hydride?

Calcium hydride appears as a white to grayish powder. It possesses a peculiar odor, has a high melting point, and is soluble in hot water, but insoluble in cold water.

3. What is calcium hydride used for?

Calcium hydride is used as a desiccant, source of hydrogen gas, and in the synthesis of various metal hydrides.

4. What precautions must be taken while handling calcium hydride?

Personal protective equipment must be worn including splash goggles, protective gloves, and a dust respirator to avoid eye and skin contact with the compound, and inhaling the dust.

5. Is calcium hydride flammable?

No, it is not flammable, but it reacts with water, releasing flammable hydrogen gas.

6. Where can I purchase calcium hydride?

Calcium hydride is available from various reputable suppliers, including Sigma-Aldrich, Alfa Aesar, and Chem-Supply, as well as online stores such as Amazon, eBay, and Alibaba.

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