What is the solubility of 143 - 33 - 9 in organic solvents?
What is the solubility of 143 - 33 - 9 in organic solvents?
As a supplier of the chemical compound with the CAS number 143 - 33 - 9, which is sodium cyanide (NaCN), I am often asked about its solubility in organic solvents. Understanding the solubility of sodium cyanide in different organic solvents is crucial for various industrial applications, such as gold extraction, electroplating, and chemical synthesis.
General properties of sodium cyanide
Sodium cyanide is a white, water - soluble solid with a high melting point. It is highly toxic and reacts with acids to produce hydrogen cyanide gas, which is also extremely poisonous. In water, sodium cyanide dissociates into sodium ions (Na⁺) and cyanide ions (CN⁻). The solubility of sodium cyanide in water is quite high, with approximately 48 grams per 100 milliliters of water at 20°C.
Solubility in organic solvents
The solubility of sodium cyanide in organic solvents is generally lower compared to its solubility in water. This is because sodium cyanide is an ionic compound, and organic solvents are typically non - polar or weakly polar. Ionic compounds tend to dissolve well in polar solvents like water due to the ability of the solvent molecules to surround and stabilize the ions through ion - dipole interactions.
- Alcohols: In lower - molecular - weight alcohols such as methanol and ethanol, sodium cyanide has a certain degree of solubility. Methanol is a polar solvent with a relatively high dielectric constant. Sodium cyanide can dissolve in methanol to form a solution. The solubility in methanol is influenced by factors such as temperature. As the temperature increases, the solubility of sodium cyanide in methanol also increases. For example, at room temperature, a few grams of sodium cyanide can dissolve in 100 milliliters of methanol.
- Aprotic polar solvents: Solvents like dimethyl sulfoxide (DMSO) and dimethylformamide (DMF) are aprotic polar solvents. They have high dielectric constants and can solvate ions effectively. Sodium cyanide shows relatively good solubility in these solvents. In DMSO, the solubility is sufficient for many chemical reactions that require the presence of cyanide ions in an organic medium. These solvents are often used in organic synthesis reactions where the use of an organic - soluble source of cyanide is necessary.
- Non - polar solvents: In non - polar solvents such as hexane, benzene, and toluene, sodium cyanide has extremely low solubility. Non - polar solvents lack the ability to interact with the ionic species of sodium cyanide through significant intermolecular forces. As a result, only trace amounts of sodium cyanide can dissolve in these solvents, if any at all.
Importance of solubility in industrial applications
- Gold extraction: In the gold mining industry, sodium cyanide is a widely used leaching agent. The process of gold extraction involves the dissolution of gold in a cyanide solution. While water is the primary solvent for this process, the solubility of sodium cyanide in some organic solvents can be relevant in certain advanced extraction techniques or in the purification steps. For more information on sodium cyanide in gold extraction, you can visit Sodium Cyanide Solution and Sodium Cyanide.
- Electroplating: In electroplating processes, sodium cyanide is used to provide a source of cyanide ions for the plating bath. The solubility of sodium cyanide in the plating solution, which may contain some organic additives, affects the uniformity and quality of the plated layer. The ability to dissolve sodium cyanide in appropriate organic solvents or solvent mixtures can help optimize the electroplating process.
- Chemical synthesis: Organic synthesis reactions often require the use of cyanide ions to introduce a cyano group into organic molecules. The solubility of sodium cyanide in organic solvents allows these reactions to occur in an organic medium, which can be beneficial for controlling reaction conditions and selectivity.
Factors affecting solubility
- Temperature: As mentioned earlier, temperature has a significant impact on the solubility of sodium cyanide in organic solvents. Generally, an increase in temperature provides more kinetic energy to the solvent molecules and the solute ions, allowing for more effective solvation and dissolution. This is true for most solvents, whether polar or non - polar.
- Solvent properties: The polarity, dielectric constant, and hydrogen - bonding ability of the solvent play crucial roles in determining the solubility of sodium cyanide. Polar solvents with high dielectric constants are more likely to dissolve sodium cyanide compared to non - polar solvents. Additionally, solvents that can form hydrogen bonds with the cyanide ions or the sodium ions may enhance solubility.
- Impurities: The presence of impurities in the sodium cyanide sample or the organic solvent can affect solubility. Impurities may interact with the solute or the solvent, altering the intermolecular forces and thus the solubility behavior.
Safety considerations
It is important to note that sodium cyanide is a highly toxic substance. When handling solutions of sodium cyanide in organic solvents, strict safety protocols must be followed. This includes wearing appropriate personal protective equipment, working in a well - ventilated area, and having proper emergency response measures in place. In addition, the disposal of sodium cyanide - containing solutions must comply with environmental regulations.
If you are interested in purchasing sodium cyanide for your industrial or research needs, we are here to provide you with high - quality products. We can offer technical support to help you understand the solubility and application of sodium cyanide in your specific processes. Feel free to contact us for more information and to start a procurement negotiation.
References
- Handbook of Chemistry and Physics.
- Advanced Inorganic Chemistry by F. Albert Cotton and Geoffrey Wilkinson.
- Organic Synthesis: Strategies and Applications by Stuart Warren.