Citric acid

Preservatives Ascorbic acid is a form of vitamin C and is used as an antioxidant preservative. Ascorbic acid and its salt such as calcium ascorbate are added to food to slow down the oxidation reaction, which, for example, causes browning of newly-cut apples. Increased acidity caused by the addition of vitamin C addition, helps to prevent microbial growth and therefore preserves the freshness of the product. Provided there is good manufacturing practice, the amount of ascorbic acid that can be…

histidine kinase from Klebsiella pneumoniae). We would then purify all three proteins and record fluorescence energy values when bound to citrate for future reference. It is also crucial to test the purified proteins affinity against pyruvate and other citric acid cycle metabolites such as succinate and α-ketoglutarate, to prevent false positive results from occurring (Ewald,…

that Baking Soda and Citric Acid is what’s in the mystery mixture. That group thinks that Baking Soda and Citric Acid is in it for a lot of reasons. One reason is that the mystery mixture has circular round objects in it and the Citric Acid is circular and round. Another one is that when you cut open the Citric Acid it’s crystal clear inside. The mystery mixture is also crystal clear inside when you cut it open. The fizz time of the mystery mixture and Baking Soda and Citric Acid were both…

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,…

complex and citric acid catechol complex when compared with their individual binding energies of -3.99 kJ mol-1, -0.87 kJ mol-1 and -1.27 kJ mol-1 respectively indicating lesser inhibition effect. The results are shown in table 5 and the interactions are shown in figure 5. Table 5: Multiple substrate simultaneous docking Compound Binding energy (kJ mol-1) Intermol energy (kJ mol-1) Total internal energy Torsional energy (kJ mol-1) Energy of the unbound system RMS Catechol+Ascorbic acid…

reaches a pH of around eight, or in other words the endpoint of a solution. It also allows us to see a physical change, thus resulting in a more accurate measure of how much was titrated. Citric acid is a weak acid, making it best titrated by using a strong base, such as sodium hydroxide. The combination of a weak acid and a strong base would result in an endpoint that corresponds to the range of phenolphthalein indicator approximately a pH of eight. Image A Phenolphthalein is composed of…

Phenolphthalein is often used as an indicator in acid base reactions. The reaction used in this lab is: C_20 H_14 O_(4 (aq))+46 NaOH_((aq))→46 Na_( (aq))^++20 H_2 CO_(2 (aq))+10 H_2 O_((l)). Phenolphthalein and sodium hydroxide react to form carbonous acid, water, and Na+ ions. This reaction is a neutralization reaction, where phenolphthalein, a weak acid, reacts with a strong base, sodium hydroxide. When phenolphthalein is put into a basic solution, it turns pink. The phenolphthalein ion is…

Dianne Termine Honors Chemistry Period 5 Group: 22 Topic: Dissolving Alka-Seltzer in Different Liquids Due Date: September 30, 2016 (2) Background Research The topic of this experiment is investigating and researching whether different properties in different types of liquids affect the amount of time it takes for an Alka-Seltzer to dissolve. The independent variable would be the amount of liquid being used to dissolve the Alka-Seltzer pill. The dependent variable would be the amount of…

oxygen3. Serratia Marcescens is a gram negative bacterium. Gram negative bacteria have a thin cell of a single layer of peptidoglycan that is enclosed by an outer membrane. The outer membrane is surrounded by special phospholipids composed of fatty acids called lipopolysaccharides that are attached to a glucosamine…

air to pass through. The semipermeable membrane covering the outer and inner shell membrane has an outermost coating called the cuticle to keep bacteria from entering the pores (Nelson, n.d.). The experiment will be conducted to determine which acid or base corroded most of the eggshell in the given amount of time. There will be a control group placed into water to compare to the variable groups Diet Coke, Red Bull, and lemon juice. The dependent variable is the amount corrosion on the…