Results : Yield (mass in gram) = __________________0.128 g_____________________ Melting point of pure phenyl benzoate (OC) = ___________70O______________ Melting point of your phenyl benzoate (OC) = ___________69O______________ Questions : 1. Why do we use NaOH solution to dissolve phenol rather than water in step 1 ? Because NaOH can be use to change the phenol to ion form, which can be more soluble in the aqueous
2-propanol (bp=82 degrees C) 3. tetrahydofuran (bp=65 degrees C) 4. 1-butanol (bp=118 degrees C) 5. butanone (bp=80 degrees C) Give a better separation for the mixture to be distilled tetrahydofuran (bp=65 degrees C) because it is farthest from 100 degrees C Which alkyl halide would react fastest in a nucleophilic substitution using silver nitrate in ethanol (weak nucleophile, protic solvent)? 3-bromo-3-methylpentane (most
Liquids don't satisfy as much as solid foods, so people tend to lose track and compensate for the calories in their drink with the calories they eat. It is the most inconspicuous sources of added weight. Stevia is gaining popularity in the United States as a no-calorie sweetener. Sugar replacements are a good way to contain calories. Stevia is all-natural and comes from a plant, unlike artificial sweeteners.
According to the Revell's lab experiment, aspirin, acetaminophen, caffeine recoveries are 60% or higher, <10% and <5%, respectively. The reason for such a low percent recoveries for acetaminophen is due to a formed solid is too fine to be filtered, and for caffeine is due to its low solubility in diethyl ether(1.8mg/ml) than in water (22mg/ml). Not only caffeine's solubility in water can affect its percent recoveries, but also it can affect other two compounds by contaminating with caffeine. For the TLC, expected approximate Rf values for aspirin, acetaminophen, and caffeine are 0.6, 0.3, and 0.1 , respectively. Procedures A.
Oxidation of Vitamin C with 2, 6-dichlorophenolindophenol (DCPIP) The stability of Vitamin C is affected by temperature, moisture, oxygen, light, pH, minerals, other vitamins and other food component. This is usually unstable due to multiple oxidation states and readily decomposed due to heat application (Boyer, 1986). The determination of ascorbic acid uses the following formula: mg Vitamin C = DF (mg/mL) x volume titrant used (mL) x volume extract (mL) x 100 100 g volume aliquot (mL) x mass sample (g) where DF (dye factor) = mass Vitamin C (mg) volume indophenol (ml) Table 9.2 Vitamin C Stability TIME (mins) 0 15 30 45 ASCORBIC ACID CONTENT (mg/100g sample) 60ᴼC 2.41 2.38 2.45 2.08 80ᴼC 2.41 2.45 2.31 2.35 100ᴼC 2.41 2.25 2.58 1.82 Table 9.2 shows the stability of Vitamin C to heat. The ascorbic acid content decreases as the temperature and time increases. Ascorbic acid is easily destroyed during processing and storage through the action of metals such as copper and iron.
Carb-Cutter; Blocker of Carbs or a Phony? Rumor has it that there is a miracle weight loss product that slows down the digestion of carbohydrates. These diet pills contain carb-cutter which blocks amylase, the enzyme that breaks down starch into glucose. With this being done, Carb-Cutter neutralizes the amylase before it starts the breakdown. This allows your body to pass starch through without turning it into glucose.
Are you taking any medications or supplements? 4. Blood test, Breath test (drink radioactive carbon), endoscopy, X-ray of your upper digestive tract (swallow white liquid containing barium that coats your digestive tract and makes the ulcers more visible, and VS. 5. Regular use of Ibuprofen can irritate or inflame the lining of your stomach and small intestine. Smoking can increase the risk of digestive damage.
Hydrogenation also extends the shelf life of these fatty acids, and preserves them through better stabilization. “When the hydrogen’s are on opposite sides of the double bond, called the trans configuration, the fatty acid is a trans fatty acid.” (Grosvenor & Smolin, 2006) Trans fatty acids can increase your risk of heart disease. Saturated and trans fats are considered the worst for your health due to the proven increased risk of cardiovascular disease, including stroke, and high cholesterol levels according to the American Heart Association (2010). Monounsaturated and polyunsaturated fats are better for your diet, and contain some of the best fatty acids, Omega-3 and Omega-6 fatty acids. These lipids can actually help reduce your risk of heart disease, and cholesterol related health
The Effects of Consumption on High Fructose Corn Syrup. High fructose corn syrup is a sweetener made by processing corn syrup to increase the level of fructose, usually to between 42% and 55% of the total sugar, with the balance being glucose. It is used extensively as a sweetener in processed foods and soft drinks, particularly soda and baked goods, but it is included also in many foods not normally thought of as sweet foods (“High”). High fructose corn syrup must be banned from all human consumption because of the negative health issues. High fructose corn syrup is associated with liver scarring.
Many natural ingredients can be added to a product to “bind” the water making it unavailable for the growth microorganisms. Several common ingredients the bind water are sugar, salt (has six times the capacity to bind water when compared to sugar), pectin and glycerol. A good example of a food product that contains a good deal of water with a fairly low water activity is jelly. Although composed of 50-60% water, jams usually have water activities around 0.75. The sugar and pectin in jams binds the water making it unavailable for microbial growth.