Experiment 9 - Effects on Vitamin C (with PH) Research Question: How does the change of PH (increase of decrease) effect the amount of vitamin C in a vitamin C solution? Goal of Experiment: Have the opportunity to independently design and perform a scientific study on an aspect of vitamin C decomposition. Hypothesis: I predict that by introducing HCl or NaOH into the vitamin C solution the percentage of vitamin C present in the solution will decrease. Abstract: The purpose of this lab is to determine the effects that changing the PH of a vitamin C solution will have on the concentration of vitamin C. The concentration changes will be calculated after 6 titrations (2 control, 2 with added NaOH, and 2 with added HCl) . Once calculated, these results can be analyzed and will either validate or refute my hypothesis.
Not only can the body undergo withdrawal because of its addictive tendencies, it can also lead to anxiety, insomnia, gastrotestinal disturbances and increased blood pressure (Nature, pg. 956). The idea of creating and cloning the caffeine synthase gene in order to produce newer generation of plants that are caffeine-deficient is becoming more popular. To create the same benefits, without the harmful effects of caffeine is an expensive process and may result in loss of flavor and aroma within the product (Nature, pg. 956).
Biology practical – Investigating fermentation 25/11/08 Research Question Which sugars cause yeast to respire anaerobically and produce the most CO2 out of glucose, fructose and lactose? Variables Independent The sugar solution used as a substrate for the yeast. Dependent The amount of carbon dioxide produced by the yeast in 5 minutes. Controlled Temperature of the water bath used to put the yeast in, yeast concentration (30%), sugar concentration (15%. ), the volumes of the yeast and sugar solutions (3cm3 each,), all apparatus that is used.
Name: ______________________ Date: ________________________ Student Exploration: Density Laboratory Vocabulary: buoyancy, density, graduated cylinder, mass, matter, scale, volume Prior Knowledge Questions (Do these BEFORE using the Gizmo.) Of the objects below, circle the ones you think would float in water. Why do some objects float, while others sink? ____________________________________ _________________________________________________________________________ _________________________________________________________________________ Gizmo Warm-up The Density Laboratory Gizmo™ allows you to measure a variety of objects, then drop them in water (or other liquid) to see if they sink or float. An object’s mass is the amount of matter it contains.
Both flask’s pH went up 4. Which substance, water or the buffer does a better job of maintaining pH when small amounts of strong base are added? Water does a better job at maintaining pH under these circumstances, but only slightly 5. Write equations for the reactions taking place in each of the flasks. For an equilibrium arrow ( ) is an equals sign (=) (Unless you know how to do equilibrium arrows).
Comparing the Solubility of Salt, Sugar, and Powdered Kool-Aid in Water Which substance is more soluble in water: salt, sugar, or Kool-Aid? If salt, sugar, and Kool-Aid are all added to the same amount of water until the mixture is saturated, then we predict that the Kool-Aid will be the most soluble, because it is designed to dissolve in water and the particles are more fine-grained. Manipulated Variables type of solute added (salt, sugar, Kool-Aid) Responding Variable how many teaspoons of solute it takes for water to become saturated Controlled Variables size of beaker volume of water size of teaspoon (5 ml) room temperature water temperature Materials 5 ml teaspoon stir stick beaker 200 ml of cold tap water granulated
Maxine Alexandra G. Merin February 4, 2014 BSMT-2C Principles Solubility Test: The test is based on the property of solubility of lipids in organic solvents and insolubility in water. The oil will float on water because of lesser specific gravity Reaction to Iodine to test for unsaturation of fatty acids: The unsaturated fatty acids absorb iodine at the double bonds until all the double bonds are saturated with iodine. Hence the amount of iodine required to impart its color to the solution is a measure of the degree of the fatty acids. Chloroform dissolve sample give red color which decolorizes the iodine giving brown color. This indicates the presence of fatty acids.
Tannins, which are organic compounds that can bind to alkaloids such as caffeine, are going to be taken out of the tea water using sodium carbonate. The sodium carbonate is a base, which will convert the acidic tannins into sodium salts that are highly soluble in water. Isolating the caffeine will continue once methylene chloride is added to the remaining tea solution, which increases the solubility of the caffeine. Methylene chloride can be evaporated quickly leaving the caffeine to be purified by sublimation. Materials and Methods: The tea solution was obtained when a tea bag was placed in boiling water and its liquid mix was carefully squeezed into a beaker; and eventually placed into a test tube.
To get accurate result, this titration process are repeated for another two times. The entire procedure by which we obtain the molarity of a solution of one substance (NaOH) from an accurately known amount of another substance (KHP) is called standardization. The average molarity of the sodium hydroxide solution will be used in the next experiment. The second experiment is conducted to determine the molarity of acetic acid and mass percent in vinegar. 100mL of distilled water was added to 10mL of vinegar and followed by 1mL of NaOH was pour into the solution.