analysis of aspirin tablets Procedure a. Weigh accurately a definite number of aspirin tablets (two or three tablets weighing no more than 1.5 g) into a 250 cm3 conical flask. Initiate the hydrolysis of the aspirin by adding 25 cm3 of 1.0 M sodium hydroxide by pipette‚ diluting with approximately the same volume of distilled water. Warm the flask over a tripod and gauze for ten minutes to complete the hydrolysis. b. Cool the reaction mixture and transfer with washings to a 250 cm3 volumetric flask
Premium Sodium hydroxide PH indicator Titration
toothpaste. Instead of using standard titration methods where an acid is titrated directly using a standard solution of a base‚ back titration is used because the sample to be analysed‚ CaCO3 does not dissolve in water. Hydrochloric acid and sodium hydroxide are the reagents used in this experiment. The precise measured amount of HCl is added to the weighted portion of toothpaste which is CaCO3. When the reaction between HCl and CaCO3 is completed‚ the excess HCl is back-titrated against NaOH until
Premium Titration Sodium hydroxide
The rate constant of the depolymerization of diacetone alcohol via basic catalysis was determined by monitoring the change in volume as a function of time at constant temperature of a pseudo first order reaction where the species in excess was sodium hydroxide. This was accomplished by using a dilatometer as the apparatus and following both methods: isolation and initial rates in conjunction. Introduction Depolymerization is the process in which a compound is converted into one of a smaller molecular
Premium Rate equation Sodium hydroxide Reaction rate
Topic 11a – Group 7‚ the Halogens Revision Notes 1) Trends in physical properties of the elements • At room temperature‚ Cl2 is a pale green gas‚ Br2 is a brown liquid‚ I2 is a blue-black solid. • In Group 7‚ boiling point increases down the group because the molecules have more electrons and‚ therefore‚ stronger van der Waal’s forces which require more energy to overcome them • Electronegativity is the ability of an atom to attract the electrons in a covalent bond • Down
Premium Sodium hydroxide Chlorine Hydrogen
Acid-Base Titrations: Analysis of Antacid Tablets Cuenca‚ Carlo Nicolo B. Del Prado‚ Rockson D. MEB21 Bachelor of Science in Biology – Major in Medical Biology College of Science De La Salle University – Dasmariñas Dasmariñas‚ Cavite Philippines ABSTRACT This experiment was performed to learn the technique of acid-base titration and to compare the efficiency of commercially available antacids by looking at their weight of HCl and weight of antacid values. The analysis of antacid
Premium PH Gastroesophageal reflux disease Acid
N-nitrosodimethylamine (NDMA) and other six volatile N-nitrosamines (NAms) from meat products. Parameters affecting the efficiency of MAE and D-l-SPE were systematically investigated. For MAE‚ 5-g of a homogenised meat sample was extracted with 30 mL of a sodium hydroxide (0.025 M) solution at 100 °C for 10 min. The optimum D-l-SPE conditions were immersing 100 mg of Carboxen™ 1000 adsorbent in the MAE extract. After vigorously shaking for 30 min‚ the NAms were then desorbed by treatment with 200 lL of dichloromethane
Premium Analytical chemistry Pork Sodium hydroxide
added to food to keep them preserved and protects against mold. It is also used in photography- It allows the pictures to lighten in a dark room. Also have searched on Three examples of alkaline they are as follows: NaOH (Sodium Hydroxide)‚ NH3 (Ammonia) and KOH (Potassium Hydroxide). : NaOH is used for mostly to clean. Like drains. NH3 is mainly used for vehicle fuel‚ textile or even a poison treatment. And last but not least KOH‚ this alkali is used for food preparation‚ medical test and etc. I have
Premium Ammonia Base Acid
3.1 Overview The experiment was divided into three parts. In the first part was the preparation of empty CNPs. The second part was the preparation of CNPs loaded with single drug which was AA and TQ meanwhile the third part was the preparation of CNPs loaded with dual drug (AA and TQ). The last part was the analytical testing conducted to investigate the properties performance such as smaller or larger in trend as well as to characterize the entrapment efficiency of drugs. The chemicals and technique
Premium Chemistry Acid Acetic acid
quantities by the pyrolysis of the sodium salt of benzene sulfonic acid‚ by the Dow process‚ and by the air oxidation of cumene. Each of these processes is described below. You can also prepare small amounts of phenol by the peroxide oxidation of phenylboronic acid and the hydrolysis of diazonium salts. Pyrolysis of sodium benzene sulfonate In this process‚ benzene sulfonic acid is reacted with aqueous sodium hydroxide. The resulting salt is mixed with solid sodium hydroxide and fused at a high temperature
Premium Oxygen Sodium hydroxide Alcohol
+ 2NO3-(aq)---> Cu2+(aq) +2NO2(g) + 2H2O(l) The reaction of aq copper nitrate with sodium hydroxide was the turning of the solution to a blue color‚ when water was added a cloudy mass of blue was formed below. This precipitate was copper (II) hydroxide. The precipitate was blue because of the copper ions. the balanced equation for this is Cu2+(s) + 2OH-(s) ---> Cu(OH)2O(s) The third reaction copper (II) hydroxide solution was heated‚ the solution turned from a bright blur precipitate turned into
Premium Copper Sulfuric acid Nitric acid