Identifying specific chemicals can be a complex task, especially when compounds have multiple names or are known by different terms in various languages. To address this challenge, the Chemical Abstracts Service (CAS) has assigned over 163 million organic and inorganic compounds unique CAS Registry Numbers—strings of numbers separated by hyphens, such as "xxxx-yy-z." These numbers function like a chemical's social security number, ensuring that no matter what name a compound is known by, it always has one and only one CAS number. This system greatly simplifies scientific communication, eliminating confusion caused by lengthy or inconsistent naming conventions. For instance, methanol is known by numerous synonyms, including methyl alcohol, wood alcohol, carbinol, and MeOH, among others. If you search for methanol in different languages, the list becomes even longer. However, by using its CAS number, 67-56-1, you eliminate all ambiguity. Additionally, CAS numbers are assigned to specific forms of a compound. For example, while both 1317-38-0 and 1317-39-1 refer to cupric oxide, the former might appear as a wire, while the latter is a black powder. This distinction prevents confusion about which form is being discussed. CAS numbers are widely used in laboratories, chemical businesses, and educational settings. They are easy to find on the internet and completely free to access. Whether you're a student, researcher, or professional in the chemical industry, understanding and using CAS numbers is essential for accurate communication and record-keeping. The CAS was established in 1907 as a division of the American Chemical Society to help scientists access literature more efficiently. In the 1960s, the organization introduced the CAS number system to streamline chemical identification. By 1980, the CAS online database became an indispensable tool for researchers worldwide. Today, regulatory agencies like the U.S. Environmental Protection Agency (EPA) and the European Union’s REACH program rely heavily on CAS numbers for the accurate identification of chemical substances. If you're looking for a reliable way to find a compound’s CAS number, two of the most trusted sources are ChemIDplus from the National Library of Medicine and the NIST Chemistry Webbook from the National Institute of Standards and Technology. Let’s take a quick look at how to use ChemIDplus. Start by searching “ChemIDplus†on Google, then click on the first result. You’ll land on the “ChemIDplus Advanced†page. Enter the name of the compound you’re interested in under “Substance Identification.†I'll use ibuprofen as an example, since my father and I recently had a discussion about its validity. Once you enter the compound name, the CAS number will typically appear directly below the substance name, labeled as “RN†for Registry Number. Keep in mind that different websites may format CAS numbers differently, sometimes using brackets or other notations. However, the key point is that each compound—and each of its specific forms—has its own unique CAS number. Always double-check to ensure accuracy, because a mismatch could lead to serious issues in research, safety, or application. City Chemical LLC offers a wide range of bulk chemicals for industrial and commercial use. Explore our featured products at www.citychemical.com/featured-chemicals.html to learn more and place your order today.
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