Acetic anhydride

Analysis of aspirin tablets Purpose: Determine the percentage of 2-ethanoylhydroxybenzoic acid in aspirin tablets. Introduction (including background information) : Before creating Aspirin, “sail alba” was used. In 1860’s, chemists discovered that Salicylic acid (2-hydroxybenzoic acid, C7H6O3 ) is the active acid in sail alba. Salicylic acid is relatively strong though. It can irritate and damage the stomach membranes and mouth. In 1889, ethanoate ester of salicylic acid was introduced by the…

PHYSICAL PROPERTIES: It has two isomeric forms 1, 2, 3-triazole and 1,2,4-triazol with common molecular formula C2H3N3,and both have 69.06 molecular weight. [2]] 1, 2, 4-triazole derivatives simply exist in solid forms. 3, 4, 5-substituted 1, 2, 4-triazole derivatives melts on thermolysis when heated at high temperature3160C for half an hour. 1, 2, 4-Triazole derivatives are easily soluble in polar solvents and slightly soluble in non-polar solvents. However the solubility in non-polar solvents…

Purpose The purpose of this lab was to separate unknown compound 204, composed of an amine, a carboxylic acid, and a neutral component, into each of its three respective states. The unknown compound was separated using microscale separation of acidic, basic, and neutral components by liquid/liquid extraction. Liquid/liquid extraction is a very common method often used in work-ups and allows for isolation of neutral components using acid/base chemistry; this method is extremely helpful in…

Abstract: A simple, novel, and sensitive method developed for estimation of Dappagliflozin and Saxagliptin. The method was carried out on reverse- phase C18 inertsil column, with mixture of Methanol: Water ( 80:20) ratio as a mobile phase, 1 ml / min flow rate. Different analytical parameters such as linearity, precision, accuracy, Limit of detection (LOD), Limit of Quantification (LOQ), robustness were determined according to the International conference on Harmonization ICH guidelines. The…

Experiment 5 Synthesis and NMR Spectroscopy of ethyl cinnamate Introduction: Wittig reactions involve the stereoselective synthesis of olefins from phosphonium ylides and aldehydes or ketones, where the carbonyl bond is converted to an alkene double bond.1 The variety of suitable reagents and the relatively mild experimental conditions facilitate their industrial applications, such as the synthesis of epoxides, esters, carotenoids and vitamin A.2,3 Specifically, the ester ethyl cinnamate is used…

(Phillipsburg, NJ, USA). For quantitative analysis, phenolic compounds used for the standards were isolated from barley leaves, as reported in earlier method (Park et al., 2014). DPPH, ABTS, BHT, Trolox, and potassium persulphate, Sephadex LH-20, acetic acid, formic acid, and DMSO-d6 were obtained from…

Introduction Spinach is a leafy green plant that is high in vitamins. Spinach gains its green color from the pigments it contains which help the plant absorb sunlight needed for photosynthesis. The main pigments are chlorophyll a, chlorophyll b, and β-carotene. Chlorophyll presents as a green pigment and is a porphyrin while β-carotene is a red-orange pigment and a carotenoid. [1] They are both found in all pants and are sensitive to exposure to light and air. β-carotene has been used in the…

Abstract. In this work investigation for the effect of compressed CO2 on the morphology of the produced Polyaniline (PANI) was carried out. The conventional oxidative polymerization using ammonium peroxydisulfate as oxidizing agent was used with and without compressed CO2. The results showed that different morphologies of PANI nanorods and PANI nanoparticles were produced using the conventional polymerization with and without compressed CO2 respectively. Molecular characterization of the…

QUESTION: Give the Preparation, Properties and Applications of any four POLYMERS 1. Polyethenics ( Vinyl Resins) They are obtained by the polymerization of monomers containing the ethylenic bond (-C=C-) I. Polyethylene ( PE ) Polyethylene is one of the simplest and most inexpensive polymers. It is a waxy, chemical inert plastic. It a thermoplastic formed by the addition polymerization of ethylene. There are two types of polyethylene  Low Density polyethylene (LDPE) By using free radical…

INTRODUCTION CLASS : B.S-VIII CHEMISTRY SUBJECT: ENVIRONMENTAL ANALYTICAL CHEMISTRY TOPIC: SOFT DRINKS & ITS HARMFUL EFFECTS SUBMITTED TO: DR. SANA MUSTAFA MADE BY: HAFIZ MANSOOR HUSSAIN 11/05/2014 HAFIZ MANSOOR HUSSAIN 2 3. WHAT ARE SOFT DRINKS ? ? ? ? ? ? ? Soft drink is also known as club soda, soda water, sparkling water, carbonated water & fizzy water. It is water into which carbon di oxide gas under pressure has been dissolve, a process that cause the water to become effervescent. and…