Salicylic acid

aspirin Aspirin, also known as acetylsalicylic acid, is an aromatic compound containing both a carboxylic acid functional group and an ester functional group. Aspirin, being a monoprotic weak acid, is only slightly soluble in water and it can be prepared by reacting salicylic acid and acetic anhydride in the presence of an acid catalyst. 1.2: History of aspirin Aspirin was first produced about 110 years ago but the natural form, salicylic acid, found in plants (i.e. the willow and myrtle)…

aspirin from salicylic acid and acetic anhydride. The general theory behind this experiment was to study the synthesis of a drug from organic materials. During the experiment, esterification had occurred between reactants salicylic acid and acetic anhydride. Then, phosphoric acid would catalyze the reaction and water would be added to decompose the remaining acetic anhydride. Through the process of filtration, aspirin crystals were collected and separate from the liquid acetic acid-water…

the moles of reactants were calculated (Part A). Part B of the calculations illustrates the amount of aspirin produced by each reactant based on 1:1 mole ratio defined by the balanced equation of the reaction. According to these calculations, salicylic acid is the limiting reagent because it produces the least amount of aspirin. Thus, the limiting reagent, if fully consumed, dictates the theoretical…

Acetylsalicylic Acid from Salicylic Acid Shultz, Joshua T. Chemistry 2210L Data Figure 1. Esterification of Salicylic Acid to Yield Acetylsalicylic Acid Figure 2. Acetyl Group Table 1. Reference Data, Experimental Volumes, Yields, and Melting Points Melting Point of Salicylic Acid 158° C Melting Point of Acetylsalicylic Acid 138° C - 140° C Initial Mass of Salicylic Acid 0.510 g Theoretical Yield of Acetylsalicylic Acid 0.665 g Experimental Yield of Acetylsalicylic Acid 0.524 g…

The goal of this experiment was to use the technique of thin layer chromatography (TLC) to identify the active analgesic ingredient of Advil and monitor the transesterification of methyl salicylate from acetylsalicylic acid. The synthesized methyl salicylate was then purified using acid-base chemistry and analyzed using H NMR spectroscopy. Identification of a proper mobile phase to separate common analgesics used in over-the-counter pain relievers was essential in being able to determine the…

oxygen3. Serratia Marcescens is a gram negative bacterium. Gram negative bacteria have a thin cell of a single layer of peptidoglycan that is enclosed by an outer membrane. The outer membrane is surrounded by special phospholipids composed of fatty acids called lipopolysaccharides that are attached to a glucosamine…

is a neutralization reaction. A neutralization reaction is a chemical reaction in which an acid and a base react to form an ionic compound (a salt) and water; the resulting pH is closer to 7. The general chemical equation for a neutralization reaction is: Acid + Base Water + Ionic Compound This can also be considered as a double displacement reaction. However, since the reacts are an acid (carbonic acid) and a base (sodium hydroxide) and the products are a salt (sodium carbonate) and water…

go to 7 or 7.8, it can be deadly. The blood buffer contains carbonic acid which dissociates into bicarbonate acid and hydrogen ions. This equation can also be reversed; it is a chemical equilibrium. If the hydrogen ions rise, bicarbonate accepts the hydrogen ions and the equilibrium shifts left thus making the blood acidic. When the blood becomes acidic, acidosis…

Introduction: Many chemical compounds are broken down into two very distinct categories: acidic or basic. Acidic, based on the Bronsted-Lowry Theory, is defined as a proton (H+) donor. An equation exemplifying an acid dissolving in water is: HCl (g) H2O H+ (aq) + Cl- (aq) A base, based on the Bronsted-Lowry Theory, is defined as a proton (H+) acceptor. An equation exemplifying a base dissolving in water: NaOH (s) H2O Na+ (aq) + OH- (aq) Molarity, also known as the concentration…

nanomechanical retention which is due to polymerisation of hydrophilic monomers around acid exposed collagen fibres.1 The entanglement of these monomers within the exposed collagen fibres gives rise to the so called Hybrid layer , which is also referred as Resin infiltrated Dentin layer.2 The presence of hybrid layer is important for attainment of a leakage free interface between the cavity walls and resin composite.2 After acid etching, the demineralized collagen matrix is present in a…