As a reliable supplier of the compound with CAS 631 - 61 - 8, I am frequently asked about its chemical structure. Understanding the structure of a chemical compound is crucial as it provides insights into its physical and chemical properties, reactivity, and potential applications. In this blog, I'll delve into the details of the structure of the compound identified by CAS 631 - 61 - 8.
The Significance of CAS Numbers
Before we dive into the structure, let's briefly touch on what a CAS number is and why it's important. The Chemical Abstracts Service (CAS) assigns a unique numerical identifier to every chemical substance described in the open scientific literature. This identifier, known as the CAS number, serves as a universal reference for a specific chemical compound, regardless of its various names or synonyms. CAS 631 - 61 - 8 is one such identifier that precisely pinpoints a particular chemical entity.
Structure of the Compound with CAS 631 - 61 - 8
The compound with CAS 631 - 61 - 8 is sodium carbonate decahydrate, with the chemical formula $Na_2CO_3\cdot10H_2O$. At the molecular level, its structure is a fascinating combination of ionic and hydrate components.
Ionic Structure
Sodium carbonate ($Na_2CO_3$) is an ionic compound. It consists of sodium cations ($Na^+$) and carbonate anions ($CO_3^{2 - }$). The sodium ions are positively charged due to the loss of one electron, while the carbonate ion is negatively charged. The carbonate ion has a trigonal - planar structure. The carbon atom in the center is $sp^2$ hybridized, and it is bonded to three oxygen atoms. One of the carbon - oxygen bonds is a double bond, and the other two are single bonds. The resonance structures of the carbonate ion contribute to its stability. The negative charge is delocalized over the three oxygen atoms, which gives the ion a symmetrical and stable structure.
The sodium ions are attracted to the negatively charged carbonate ions through electrostatic forces, forming an ionic lattice. In the solid state, these ions are arranged in a regular three - dimensional pattern, held together by strong ionic bonds.
Hydrate Structure
The "decahydrate" part of sodium carbonate decahydrate indicates that each formula unit of $Na_2CO_3$ is associated with ten water molecules ($H_2O$). These water molecules are incorporated into the crystal structure of the compound. The water molecules form hydrogen bonds with the carbonate anions and the sodium cations. The oxygen atoms in the water molecules can interact with the positively charged sodium ions, and the hydrogen atoms in the water molecules can form hydrogen bonds with the oxygen atoms of the carbonate ions.
This hydrate structure has a significant impact on the physical properties of the compound. For example, sodium carbonate decahydrate is a white, crystalline solid at room temperature. The water molecules in the crystal lattice contribute to its relatively low melting point compared to anhydrous sodium carbonate. When heated, sodium carbonate decahydrate loses its water of crystallization in a step - wise process, eventually forming anhydrous sodium carbonate ($Na_2CO_3$).
Physical and Chemical Properties Related to Structure
The structure of sodium carbonate decahydrate directly influences its physical and chemical properties.
Physical Properties
- Appearance: As mentioned earlier, it appears as large, colorless, transparent crystals. The regular arrangement of ions and water molecules in the crystal lattice gives it a well - defined crystalline structure.
- Solubility: It is highly soluble in water. The ionic nature of sodium carbonate allows it to dissociate into sodium and carbonate ions in an aqueous solution. The water molecules in the hydrate structure also play a role in the solubility process. They can interact with the ions and help to stabilize the dissolved species.
- Melting Point: Its melting point is relatively low, around 32.5 - 34.5°C. The presence of water molecules in the crystal lattice weakens the overall lattice energy, making it easier for the compound to melt compared to anhydrous sodium carbonate, which has a much higher melting point (851°C).
Chemical Properties
- Reaction with Acids: Sodium carbonate decahydrate reacts with acids to produce carbon dioxide gas, water, and a salt. For example, when it reacts with hydrochloric acid ($HCl$), the following reaction occurs:
$Na_2CO_3\cdot10H_2O + 2HCl\rightarrow2NaCl + CO_2\uparrow+ 11H_2O$
The carbonate ion in the compound reacts with the hydrogen ions from the acid, resulting in the formation of carbonic acid ($H_2CO_3$), which then decomposes into carbon dioxide and water. - Alkalinity: In aqueous solution, sodium carbonate decahydrate exhibits basic properties. The carbonate ion hydrolyzes in water, producing hydroxide ions ($OH^-$):
$CO_3^{2 - }+H_2O\rightleftharpoons HCO_3^-+OH^-$
This reaction makes the solution alkaline.
Applications Based on Structure and Properties
The unique structure and properties of sodium carbonate decahydrate make it useful in various applications.
Detergent Industry
In the detergent industry, it is used as a water softener. The carbonate ions can react with calcium and magnesium ions present in hard water, forming insoluble carbonates. This removes the hard - water ions from the water, making the detergent more effective. For example:
$Ca^{2 + }+CO_3^{2 - }\rightarrow CaCO_3\downarrow$
The reaction is based on the ionic nature of the compound and the ability of the carbonate ion to form insoluble salts with certain metal ions.
Food Industry
It is used as a food additive, with the E number E500(ii). It can be used as a raising agent in baking, similar to baking soda. When heated in the presence of an acid in the dough, it releases carbon dioxide gas, causing the dough to rise.
Glass Manufacturing
In the glass - making process, sodium carbonate decahydrate serves as a flux. It helps to lower the melting point of silica ($SiO_2$), the main component of glass. The presence of sodium ions from the compound disrupts the silica network, making it easier to melt and shape the glass.
Related Compounds and Our Offerings
As a supplier, we also deal with other related compounds. For instance, we offer 4 - Hydroxybutyl Acrylate/4 - HBA CAS 2478 - 10 - 6, which is an important organic chemical. It has a different structure, with an acrylate functional group and a hydroxy - butyl side chain. This compound is widely used in the production of polymers and coatings.
Another compound in our portfolio is 1,4 - Bis(4 - aminophenoxy)benzene CAS 3491 - 12 - 1. Its structure consists of a central benzene ring with two aminophenoxy groups attached at the 1 and 4 positions. This compound is used in the synthesis of high - performance polymers.
We also supply 2,2 - Bis(3 - amino - 4 - hydroxyphenyl)hexafluoropropane CAS 83558 - 87 - 6. It has a complex structure with a hexafluoropropane backbone and two aminohydroxyphenyl groups. This compound is used in the development of advanced materials with special properties.
Contact Us for Procurement
If you are interested in purchasing the compound with CAS 631 - 61 - 8 or any of our other products, we invite you to contact us for procurement. Our team is dedicated to providing high - quality products and excellent customer service. We can offer competitive prices, reliable delivery, and technical support. Whether you need a small quantity for research purposes or a large volume for industrial applications, we can meet your requirements. Reach out to us to start a discussion about your procurement needs.
References
- CRC Handbook of Chemistry and Physics. 99th Edition.
- Kirk - Othmer Encyclopedia of Chemical Technology.
- "Chemistry: The Central Science" by Brown, LeMay, Bursten, Murphy, and Woodward.
