Isolation of Caffeine from Tea CHEM243A 2-23-11 Abstract: The purpose of this experiment was to isolate caffeine from a tea bag. Once isolated, the caffeine was purified using sublimation. The percent recovery was calculated to be 83.3%. The melting point of the original substance was 51ºC-139ºC. Since it was inaccurate, the melting point of another group’s sample was recorded.
Will soft drinks dissolve a steel nail? By: Alexis Arms Abstract Is a can of soda strong enough to dissolve a steel nail in only four days? The purpose of this experiment is to test whether phosphoric acid, found in soda, can dissolve a nail or if it’s just a fictitious story. The reason I was interested in this topic is because my father once told me that the phosphoric acid in a can of soda was strong enough to dissolve a steel nail. I searched for answers on the internet but found out that people were on both sides of the fence.
Put the stopper into the boiling tube but do not place the delivery tube under the measuring cylinder yet. 3. Fill the syringe with 1 ml 10% hydrogen peroxide and attach to the syringe needle. 4. Add the hydrogen peroxide to the yeast suspension.
Spectrophotometric Determination of Benzoic Acid Concentration in Non-diet Soft drinks Abstract The concentrations of benzoic acid in non-diet soft drinks (sprite, 7-up and virgin lime) was determined using UV-Vis spectrophotometer. Experimentally, the benzoic acid acquired a λmax of 220 nm. By setting the photometric mode at 220 nm, sprite obtained 142.200 ppm, 7-up attained 170.425 ppm and 141.300 ppm for virgin lime. INTRODUCTION Non diet soft drinks are beverages that contain sweetener, carbonated water, flavouring agent and food preservative. Manufacturers of soft drink commonly used benzoic acid or sodium benzoate as food preservatives.
You can buy Pepsi anywhere such as CVS, Walgreens, Wal-Mart etc. The new name, Pepsi-Cola, comes from two of the prime ingredients which are pepsin and kola nuts. The name was first used on August 28TH the year was 1889, the original name before was “Brad’s Drink “. Throughout the years Pepsi has come out with different kinds of flavors or versions of Pepsi such as cherry and diet. Diet Pepsi contains a zero-calorie cola beverage which is an artificial sweetener with aspartame and ace k. Diet Pepsi contains 2.92 mgs of caffeine per fluid ounce (9.86mg/100mls).The ingredients is carbonated water, caramel color, aspartame, phosphoric acid and potassium benzoate so it preserves freshness.
a. One of the arguments about bacteria on beer pong cups is that the alcohol in the beer kills any germs that you may come in contact with. This, plain and simple, is not true. According to the U.S. Food and Drug Administration, alcohol becomes effective at killing germs in concentrations above 70%. So a 4-5% alcoholic beverage is not going to kill any germs.
KSCN ionizes into K+ and SCN-, and in the presence of the H+ ion supplied by nitric acid, the H+ and SCN- will combine to form the weak acid HSCN. Since there is a large excess of nitric acid compared to KSCN, we can assume that all of the SCN- will be in the form of HSCN. Procedure part 2: Six test tubes were filled with various amounts of 0.003M sodium thiocynate. A constant amount of 10 ml of 0.003 M Fe(NO3)3. The first tube had no sodium thiocynate.
Steps in the Mentos in Pop Experiment Soda and Mentos Volcano This is the classic experiment. It requires a couple Mentos and a 2-liter bottle of soda. Directions: Remove the lid from the bottle and the paper and foil wrappers from the Mentos. Drop a couple Mentos into the bottle. This will cause the "eruption" and you should see a 3- or 4-foot plume of bubbly cola.
5. Pour the NaOH by twisting the stop cock. Shake the flask while pouring. Pour until a slight pink color starts to appear. At this point pour very slowly until the whole solution turns a pale pink.
Video Case 1 Emanuel Dozier Questions 1. A. He got ideas from college students by asking students to dump the contents of their backpacks on the table and explain what they carried around and then to react to some early highlighter models. Several instances six or seven students were interviewed together and observed by 3M researches from behind a one way mirror. Other students were interviewed individually.