Hydrogen chloride
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== Introduction == | == Introduction == | ||
| - | + | Hydrogen chloride, also known as hydrochloric acid or HCl, is lack of color and hygroscopic compound, which has powerful inclination to draw water and vaporize them. (Cox 304-305) Moreover, they are soluble in water at 20 Celsius degree, they convert into solid at -114.2 Celsius degree, and they convert into liquid at -85.1 Celsius degree. In addition, it is strong acid, so that it is corrosive and irritating in case of skin and eyes contacts.[http://www.osha.gov/SLTC/healthguidelines/hydrogenchloride/recognition.html] Hydrogen chloride can be found during coal burning and volcanoes. Most of hydrogen chloride occurs at the coal fired plants, which is like powerhouse that burn coals to create energy. Moreover, a little amounts of hydrogen chloride occurs at volcanoes, and also in gastric in human body. [http://apps.sepa.org.uk/spripa/Pages/SubstanceInformation.aspx?pid=5] [http://volcanoes.usgs.gov/hazards/gas/index.php] Hydrogen chloride have been used in many industry, especially in fiber industry, it could be used in coloring, compost, even in the semiconductors. [http://www.osha.gov/SLTC/healthguidelines/hydrogenchloride/recognition.html]] Besides, hydrogen chloride affects both in environment and human body in these days by their acid characteristic. [http://www.atsdr.cdc.gov/tfacts173.html] | |
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== Properties == | == Properties == | ||
Revision as of 04:54, 20 March 2009
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| Hydrogen chloride | ||
|---|---|---|
 
| ||
| General | ||
| Systematic name | Hydrogen chloride | |
| Other names | Hydrochloric acid, Chlorohydric acid, and Hydrochloride | |
| Molecular formula | HCl | |
| Molar mass | 36.46 g/mol36.46 amu | |
| Appearance | Colorless gas, hygroscopic | |
| CAS number | 7647-01-0 | |
| Properties | ||
| Density and phase | 1.477 g/ml gas | |
| Solubility in water | 72 g/100 ml (20°C) | |
| Melting point | -114.2°C158.95 K -173.56 °F 286.11 °R | |
| Boiling point | -85.1°C188.05 K -121.18 °F 338.49 °R | |
| Acidity (pKa) | -7 | |
| Structure | ||
| Molecular shape | Linear | |
| Dipole moment | 1.05 D | |
| Hazards | ||
| MSDS | Material Safety Data Sheet | |
| Main hazards | Corrosive and irritating in case of skin or eyes contact. | |
| NFPA 704 |
0
3
2
| |
| Flash point | none | |
| R/S statement | R: 23, 35 S: .5, 9, 26, 36, 37, 39, 45 | |
| RTECS number | MW4025000 | |
| Related compounds | ||
| Other anions | Hydrogen bromide, hydrogen cyanide, hydrogen iodide, and hydrogen fluoride. | |
| Other cations | Sodium chloride | |
| Related compounds | Hydrochloric acid | |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Disclaimer and references | ||
Contents |
Introduction
Hydrogen chloride, also known as hydrochloric acid or HCl, is lack of color and hygroscopic compound, which has powerful inclination to draw water and vaporize them. (Cox 304-305) Moreover, they are soluble in water at 20 Celsius degree, they convert into solid at -114.2 Celsius degree, and they convert into liquid at -85.1 Celsius degree. In addition, it is strong acid, so that it is corrosive and irritating in case of skin and eyes contacts.[1] Hydrogen chloride can be found during coal burning and volcanoes. Most of hydrogen chloride occurs at the coal fired plants, which is like powerhouse that burn coals to create energy. Moreover, a little amounts of hydrogen chloride occurs at volcanoes, and also in gastric in human body. [2] [3] Hydrogen chloride have been used in many industry, especially in fiber industry, it could be used in coloring, compost, even in the semiconductors. [4]] Besides, hydrogen chloride affects both in environment and human body in these days by their acid characteristic. [5]
Properties
Hydrochloric acid, chlorhydric acid and hydrochloride are other names of hydrogen chloride, and those names could describe hydrogen chloride indirectly. Hydrogen chloride is a chemical compound that is a combination one hydrogen atom and one chlorine atom, which formula of HCl. Hydrogen chloride is a colorless and toxic gas and its odor piquant, which means it is irritant. Moreover, hydrogen chloride is hygroscopic that a compound that absorbs the moisture from the air. Also, hydrochloric acid is a mixture of hydrogen chloride in water, HCl in H2O and the colorless gas form yellow liquid when it burned in humid atmosphere. [6] [7] The common mercantile hydrochloric acid consists of thirty percent of hydrogen chloride and it can be divided by the percentage of hydrogen chloride and its mass. Hydrogen chloride soluble easily in water, alcohol, and benzene, however, if the temperature of water, alcohol and benzene increases then it would have smaller soluble. When hydrogen chloride liquefied in water, the result is called dilute hydrochloric acid, and they usually liquefied before it sell in the market. The density of hydrogen chloride is 1.477 gram per milliliters, it soluble in water at twenty Celsius degree, at -114.2 Celsius degree it convert into solid, called freeze, and at -85.1 Celsius degree it convert into liquid, called condense. [8][9]
Occurrences
Numerous amount of hydrogen chloride occurs during coal burning, leftover food, and active volcano. First, from coal burning and leftover food, both actions are including salt that could help hydrogen to convert into hydrogen chlroide. Plenty of hydrogen chloride happened from coal fired plants, which burns coal as fuels to create energy. Then, it supports many nations for electricity; however, burning coal, is one of the most meaningful reasons or causes of the global warming by breaking down the ozone. [10] Moreover, comparatively, there is occurring a little quantity of hydrogen chloride from volcanoes. From volcanoes, there are many chemical gases are coming out, such as sulfur dioxide, hydrogen sulfide, carbon dioxide, hydrogen chloride, and hydrogen flouride. Among these gases, hydrogen chloride is the strongest acid, which means it can damage on something badly. [11] Hydrogen chloride is not only found in volcano or coal burning; every human has gastric or stomach in their body, and there are gastric juice about 3 pH. Gastric juice chief parts are producing pepsin, and hydrochloric acid to support digestion system and support to break down the baneful germs, which means hydrogen chloride is protecting our body from diseases.[12]
Uses
In the history of chemistry, discovered of hydrogen chloride influenced modern days. Johann Glauber is the chemist who found out the hydrogen chloride by using sodium chloride. Before, it gets its name it was called by spirits of the salt because it made of salt. [13] In these days, hydrogen chloride is taking advantage of making many chemical materials, such as compost, acid for coloring and synthetic silk. Which means, they are using in fiber industry, and electric gilding, for example, they use hydrogen chloride to detach cotton from wool and nappy, and hydrogen chloride for corrode semiconductors. Also, not only in electric gilding, they could be used in metal manufactures, especially tin an tantalum. [14] [15] Moreover, the most significant use of hydrogen chloride is cleaning many materials by its extremely strong acid; therefore, it also can be used in manufactory or laboratory. This shows that they could be use in creating medicine or compounding of medicine, because of its water souble characteristic. Not only in the manufactures or industries, as it mentioned earlier in occurrence section, gastric juice contains hydrogen chloride and they are used in ingesting foods. [16]
Influence of Hydrogen Chloride
Influence in Environment
Hydrogen chloride, HCl, comes out of volcanoes and coal burnings, which brings us air pollution and it is the orgin or beginning of the global warming. As the picture left, describe about hydrochloric acid is corrosive and irritation, and corrosive, destructing the firm and hard substance, affects for buildings; however, irritation, cause pain, hurt and discomfort in human body, affects in human. Moreover, there are two levels in hydrogen chloride corrosiveness, which are low and high. If the level is low, then it would destruct substances but, the intensity would be low. However, if the level is high, then the intensity goes high and it could break buildings down. [17]Hydrogen chloride ruins the environment by their corrosiveness. They are included in the rain, known as acid rain, and when it touches with the earth, then it could damage to every living things, such as plants, fish and so on. Moreover, the acid rain is one of the significant causes or reasons of fishkill. [18]
Influence in Human
Hydrogen chloride is strong acid, which means it could affect people, such as it is corrosive and irritating in case of skin and eyes contact. The routes that hydrogen chloride could harm human body are breathing in the air that includes hydrogen chloride, and drinking the fluid of hydrochloric acid. First, breathing the air with hydrogen chloride could affect just in throat, if the hazard level is low, however, if te hazard level is high, then it could affect all the respiratory system in human body. Second, drinking hydrochloric acid could affect bad in most organs in human body, because it starts at mouth, throat, esophagus, stomach and even the small intestine and large intestine. Then, all the walls (skin and muscle) from throat through stomach would be burned, which is extremely painful and also it could extend to serious problem. [19][20]
References
- Hydrochloric Acid chemicalland21.com.
- Safety guideline for Hydrogen chloride U.S. Dept. of Labor.
- Health effect of Hydrogen Chloride gasdetection.com. Multiple Authors.
- Hydrogen chloride's properties and uses science.jrank.org.
- Chemical properties of hydrogen chloride Yoshiko Shoji.
- Hydrogen chloride atsdr.cdc.gov. Agency for Toxic Substances and Diseases Registry
- Hydrogen chloride gas in volcano USGS.gov. U.S. Dept. of the Interior.
- Hydrogen chloride Effect apps.sepa.org.uk. Scottish Environment Protection Agency.
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