Products Sulfites are added to pharmaceuticals, foods and personal care products as excipients and additives. They can also be naturally present in foods. Even the Romans used sulfur dioxide as a preservative for wine. Structure and properties Sulfites are the salts of sulfurous acid, which is extremely unstable and undetectable in water (H2SO3). Example sodium … Sulfites
Definition and properties The boiling point is the characteristic temperature at which a substance passes from the liquid to the gaseous state. The liquid and gaseous phases are in equilibrium at this point. A typical example is water, which starts boiling at 100 °C and becomes water vapor. The boiling point depends on the pressure. … Boiling Point
Products Preservatives can be found in liquid, semi-solid and solid pharmaceuticals. They are also used for food and cosmetics. Structure and properties Preservatives belong to various chemical groups. These include, for example: Acids and their salts Benzoic acid derivatives, 4-hydroxybenzoic acid derivatives. Quaternary ammonium compounds Alcohols Phenols Preservatives can be of natural and synthetic origin. … Preservative
Products Sodium sulfite is used as an excipient in pharmaceuticals. It is also used for food and cosmetics. Structure and properties Pharmacopoeially monographed sodium sulfite heptahydrate (Na2SO3 – 7 H2O, Mr = 252.2 g/mol) exists as colorless crystals and is readily soluble in water. It can be prepared with, for example, sulfur dioxide and sodium … Sodium Sulfite
Definition On the one hand, drugs contain the active ingredients that mediate the pharmacological effects. On the other hand, they consist of excipients, which are used for the production or to support and regulate the drug effect. Placebos, which consist only of excipients and contain no active ingredients, are an exception. Excipients can be of … Auxiliary Materials
Note about this article This article refers to burns in chemistry. See also under burns (medicine). Burns In chemistry, a combustion usually refers to an oxidation in which heat, light, fire, and energy are released. For example, the alkane octane is an important component of gasoline: C8H18 (octane) + 12.5 O2 (oxygen) 8 CO2 (carbon … Burns (Chemistry)
Products Pure sulfuric acid is available in specialized stores. It is one of the most important chemicals and millions of tons of it are produced annually. Concentrated sulfuric acid should not be given to private individuals in our view because of the potential risk. Structure and properties The sulfuric acid (H2SO4, Mr = 98.1 g/mol) … Sulfuric Acid
Products In pharmaceuticals, the salts of sulfurous acid, sulfites, are important. They are contained in medicines as preservatives and antioxidants. Sulfurous acid should not be confused with sulfuric acid. Structure and properties The sulfurous acid (H2SO3, Mr = 82.1 g/mol) is formed in the reaction of sulfur dioxide (SO2) with water. However, it is extremely … Sulfurous Acid
Products Sulfur dioxide is commercially available as a liquefied gas in compressed gas cylinders. Structure and properties Sulfur dioxide (SO2, 64.1 g/mol) exists as a colorless gas with a characteristic pungent and irritating sulfur odor that is soluble in water. The boiling point is -10°C. Sulfur dioxide is not combustible and is heavier than air. … Sulfur Dioxide
Products Pure sulfur is available in pharmacies and drugstores. It is found in creams, shampoos and sulfur baths, among other products. Structure and properties The pharmacopoeia defines sulfur for external use (S, Mr = 32.07 g/mol) as a yellow powder that is practically insoluble in water. Sulfur melts at about 119°C to form a red … Sulfur
