The absorbance of the mixture was measured at 30s (A1), 5min and 6min intervals. The value A2 was obtained by averaging the values of the 5th and 6th minute. b. Urea 750 ml of urea reagent 1 and 450ml of urea reagent 2 was pipetted into the same 1ml cuvette. Following that, 12ml of patient's sample was transferred into the cuvette. The absorbance of the mixture was measured at 30s (A1), 5min and 6min intervals.
The theoretical yield for Zinc Sulfide is 0.49 grams but the actual yield is 0.38 grams. So if 0.38 is divided by 0.49 and multiplied by 100 then the percent yield for Zinc Sulfide would be 77.6%. When it comes to Sodium Chloride, the theoretical yield is 0.58 grams and the actual yield is 0.45 grams. So when 0.45 grams is divided by 0.58 grams and multiplied by 100, the percent yield would be 77.5% of Sodium chloride. The actual yield is directly taken from the mass of the products in the experiment while the theoretical yield is determined by using stoichiometric calculations.
The two solvents in the unknown were correctly identified as acetone and toluene. The solvent with the lower boiling point was predicted to be acetone, as its boiling point was observed to be around 59 C, which was closest to the 56.5 C, the ideal boiling point of acetone. This result, however, had the possibility of being incorrect, since the boiling point of methanol, 64.7 C, was relatively close enough to the observed 59 C that methanol could have been incorrectly identified due to experimental errors such as turning the hot plate up too high. A similar situation could have occurred with toluene, the higher boiling point solvent, but this was less likely since there were no possible solvents that had a boiling point that close to toluene. The chromatogram confirmed the identity of the lower boiling point solvent as acetone, and the higher boiling point solvent as toluene.
Decomposition of Aspirin Studied with UV/Visible Absorption Spectroscopy Aims: To determine the concentration of salicylic acid, formed from the hydrolysis of Aspirin, at regular intervals using the UV/Visible Absorption Spectroscopy From the concentration of salicylic acid, concentration of Aspirin to be determined using an equation Calculate the rate constant of this reaction and its order from a plot of graph of ln(aspirin) vs time Discuss the overall flaws and improvements to the experiment Results: As per schedule1, 0.212g of aspirin was added to 50 ml boiling water to form salicylic acid in a 100 ml flask, of which 1 ml was then pipetted to a 50 ml volumetric flask at the 5th min. Following an ice bath, the solution was mixed
Rediet Legese iLab Week # 6 CRUDE OIL DISTILLATION Introduction: The aim of this week lab experiment is to experiment distill crude oil and to check how temperature determine the chemical properties of crude oil plus how the boiling point can also show physical properties. They are two major finding in this experiment. he first finding was the point at which the raw petroleum is heated to the point of boiling, at 275 0C, the gas and kerosene oil are refined, however the oil (lubricant ) stays as an unrefined feature oil. Another finding was that the oil at the gasoline stage was brown pinkish and for kerosene it became a grey. Procedure: Step 1: Set up the distillation apparatus.
From the bromination of 0.05g aniline, 0.156g of the product was collected. The percent yield was calculated to be 88.1%. Some amount of the product was lost when transferring the product from the Buchner funnel to the balance to measure its mass. To ensure the formation of the desired product, melting point of the product was measured to be 119.8-121.90c, which is in the range of the normal melting point of 2,4,6-tribromoanilne, 120-1220c. Thus, the product was indeed
Rf is equal to the distance traveled by the substance divided by the distance traveled by the solvent. Since the solvent used in the developing chamber was hexanes—a non-polar molecule— the more nonpolar the substance was, the stronger it would stick to the plate. This means that the more polar a pigment was, the higher it climbed on the TLC plate and would therefore have a larger Rf. There are 3 major classes of pigments present in spinach: carotenes, xanthophylls, and chlorophylls. Since the solvent is nonpolar, we would expect carotene to have the lowest Rf, then xanthophylls, and chlorophylls would have the highest.
The value of the properties of oil and biodiesel is slightly deviate from standards but these are acceptable and meets the standard requirements. 2.6 FATTY ACID COMPOSITION The major saturated fatty acids in Jatropha curcas seed oil were palmitic and stearic acids, the main unsaturated fatty acid were oleic acid and linoleic acid .The two oil sample of Jatrophacurcas contained saturated and unsaturated acid respectively. Jatropha curcas oil can be classified in the oleic and linoleic acid group. Linoleic acid which is one of the most important poly unsaturated fatty acids in human food because of its prevention of distinct heart vascular diseases .Jatropha curcas oil is predominantly made up of oleic and linoleic acids respectively. It is observed 0 % of linolenic acid C18:3.
Although now both the tannins salt and caffeine are water soluble, using an organic solvent, dichloromethane, renders tannins salt insoluble. Caffeine is more soluble in dichloromethane (14g/100g) than in water (2g/100g). Caffeine will dissolve in the dichloromethane phase while tannins salts remain in the aqueous phase. Addition of sodium sulphate will act as a drying agent and evaporation of the dichloromethane solution would yield pure caffeine which is white in
Though bitter almonds have a lot of benefits, it has one active ingredient called glycoside amygdalin which is toxic when ingested. On the other hand, the sweet almond oil does not contain that active ingredient making it safe to use when taken orally or applied on skin. What’s good about sweet almond oil is that it isn’t only suitable for the skin; it is also good for the heart. It is rich in protein, zinc, vitamin E, vitamin A and other vitamins and minerals that is helpful in keeping the skin and heart healthy. Jojoba Oil - Studies show that jojoba oil is the only oil that closely similar to the body’s sebum.