Chlorogenic acid

forms the test is positive. The triiodide test requires a visual inspection and if the colors are orange, brown or red the test is positive. The zinc ion test requires the solids to be dissolved in 2-3 mL of water (if a precipitate forms .17 M acetic acid should be added) and then to add 1 magnesium turning. If a fine black solid is deposited on the surface the test is positive. Finally the test for zinc metal requires 3 drops of 3 M HCl solution to be added to the test tube and if hydrogen gas…

Water is the best aid in attaining large, beautiful, and firm breasts. This was a major secret of the ancient Greek beauty queens. And some historical records reveal their simple recipe: dipping the breasts in cold water for five minutes every night. Nowadays, it is scientifically proven that cold water and repeated hot-icy showers are a must for the breast beauty and health. However, professionals claim that a hot water bath also has good effects on the size of breasts. Due to the excessive…

Due to the time restriction,the experiment only once. To make the experiment highly accurate, it should be performed it at least three times, with all the precise measurement of the materials needed, to avoid any kind of error. The control variable would be the solutions; corn syrup and distilled water. The mass of the egg would be tested throughout the experiment. Before placing the egg into the solutions, weigh the mass. After you have the mass recorded, place the eggs into different beakers…

CHM 144M Section C Dr. Zhu Charles Dotse Aileen Decker 8 October 2015 The Quantitative Determination of an Acid in Carbonated Beverages Abstract: The basis of this lab was to juxtapose two different titration methods in their ability to identify the end point, calculate the molarity of citric acid in the two sodas, and apprehend the differences between polyprotic and monoprotic acids. In order to accomplish this, a traditional titration, with phenolphthalein, and a modern titration,…

This chemical reaction involves neutralization, where an acid and base react to produce a neutral solution of salt and water. As this information is provided, the known concentration of NaOH(aq) is 0.25M. It is necessary to rinse out the burette with sodium hydroxide solution before starting titration, as the concentration of the base can be affected by the water used to clean the burette. At the same time, when cleaning the burette it may not have been washed thoroughly . By rinsing with…

Introduction Acid-base titrations are used to calculate properties of an acid or a base by titrating them with a strong Acid or base. In a titration, certain amount of volume of one substance usually a strong acid or base, a titrant, is added to another substance, an acid or base of some kind, until a change in properties are observed. Strong acids and bases are used because they allow the neutralization reaction between the acid and base into salt to go to completion. By titrating an unknown…

every much play nice when I must. Working alone is when I am at my best. It is probably the reason why I prefer statistics to anything that had to do with people. I means that’s I’m pure and completely myself. It is okay for me to be as bitter and acid as I was designed to be. It also means that I am at my strongest. I am at my strongest emotional and mental state. This does not mean that being around people of lesser pHs weaken me. It just means that my friends that are bases can calm me. What…

The Effect of pH levels on the Motility of Daphnia in Lake Ecosystems Introduction: The production, transportation, and use of chemicals by chemical industries can result in chemical pollution. This leads to a harmful effect on ecosystems and their balance of life (Linlin, Chen, 2012). The pH levels of aquatic environments are important because it affects the physiology of animals by changing their behaviors. The ion concentrations associated with the water and the organism’s survival can also…

III. Results Table 2: KHP Vs. NaOH Titration data Trial Initial KHP acid Volume (ml) End KHP acid volume (ml) Volume difference (ml) Volume of NaOH Base Used (ml) 1 7 mL 16 mL 9 mL 10.0 mL 2 16 mL 27.5 mL 11.5 mL 10.0 mL 3 27.5 mL 38.5 mL 11 mL 10.0 mL Table 3: Titration of HCl with NaOH Trial Initial NaOH Volume (ml) End NaOH base volume (ml) Volume difference (ml) Volume of HCl acid Used (ml) 1 4.5 mL 14.5 mL 10 mL 10.0 mL 2 30 mL 41.5 mL 11.5 mL 10.0 mL 3 19 mL 31 mL 12 mL 10.0…

3.7.1. Effect of solvent and pH The influence of the solvent on Schiff base ligand L and its metal(II) complexes were studied. The results showed that the optimal solvent for Schiff base ligand L, Co(II), Ni(II) and Cu(II) complexes were CH3CN at λemi =320, 310, 316 and 330 nm, while the optimal solvent for Mn(II) complex was DMF λemi = 312 nm, as shown in Figure 7. The effect pH on the fluorescence intensity of Schiff base ligand L and its metal(II) complexes were investigated between…