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    Acid Acid Rain

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    ACID DEPOSITION AND ACID RAIN: Acid deposition is caused by acidic particles and gases that deposit or fall to the Earth. Acid deposition can be wet or dry. Wet deposition is deposition of acidic gases such as oxides of sulfur and nitrogen and acidic particles brought down as precipitation by rain, fog and snow. Dry deposition is dry deposition of acidic gases in the absence of rain or precipitation. Acidity is measured using a scale called the pH scale. This scale goes from 0 to 14. 0 is the most

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    role of stomach acid Chapter 14 section 1 Noopur Rajendra Grade – 11AA 25/04/2016 Ms. Sara Kassem Sharjah American International School Discuss the role of hydrochloric acid in the digestion of foods. Point out how excess acid contributes to the discomfort known as indigestion. Explain how the stomach secretes a mucous layer, which protects it from being damaged by the hydrochloric acid it produces. Abstract Hydrochloric acid, which is also called HCl, is a highly corrosive acid. It is a strong

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    Results and Discussion One of the objectives of this exercise is to synthesize acetylsalicylic acid (aspirin) from salicylic acid. The mechanism for this synthesis is through nucleophilic acyl substitution. Acetic anhydride was the acetylation reagent used with the salicylic acid. The mechanisms and the reaction involved in the synthesis are seen in the following figure. 1.00 gram of fine white salicylic acid powder was weighed in a clean, dry 125mL Erlenmeyer flask. 3mL of strong smelling, clear colorless

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    Acid Rain

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    1. List some sources of acid rain. Acid rain is made by a chemical reaction that starts with sulfur dioxide and nitrogen oxides which is the main cause for the harmful effects of acid rain released in the air. These compounds get into the atmosphere where they get mixed and start to react with oxygen, water and other different chemicals to make acid rain. Sulfur dioxide and nitrogen oxide both can dissolve in water. I personally feel that it is because of humans acid rain is so harmful. Over the

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    Acid phosphatase is an enzyme commonly found in nature in plants, animals, and protists. Acid phosphatase is found in human bone and prostate tissue. The optimal conditions of acid phosphatase were tested using Michaelis-Menten kinetics to determine the ideal substrate concentration, varied pHs were tested in order to determine the optimal pH, and various temperatures were tested in order to determine the optimal temperature. Using Michaelis-Menten kinetics, the Vmax was determined to be 312.5 nmol/min/mg

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    Benzoic Acid Synthesis

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    used to synthesize benzoic acid. The importance of benzoic acid in modern world is due to its uses: the acid and its salts are used as preservatives in food: benzoic acid is globally known as E210 and sodium benzoate as E211. The benzoic acid and its precursors are also used in pharmacy and hygiene products : the shampoo and shower gel that I am using all contain sodium benzoate. With its increasing production I was curious to explore the synthesis methods for benzoic acid and try it in the laboratory

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    A mobile phase system consisting of acetonitrile and 25mM phosphate buffer of pH 3(sodium dihydrogen phosphate monohydrate adjusted with orthophosphoric acid) in a ratio 60:40 (v/v) were used. The mobile phase was degassed and filtered by passing through 0.45 µm pore size membrane filter (Millipore, Milford, MA, USA) prior to use. The flow rate was 1.0 mL min-1 all over the run. The injection volume was 20 µL. The eluent was monitored by the diode array detector (DAD) which was set at 250 nm for

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    Unknown Acid Molarity

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    Introduction: The unknown acid molarity will be determining by titration method. Titration is a process depends on concentration of known solution to another solution until the solute in the another solution completely react. Standard solution is the solution of known concentration that used in titration. In this experiment, NaOH was the titrant (base) however, the two analyte which used were HCl and H2SO4. The chemical reaction equations are molecular and ionic molecular equation for (NaOH) and

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    Benzoic Acid Lab Report

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    Abstract The unknown concentration of benzoic acid used when titrated with standardized 0.1031M NaOH and the solubility was calculated at two different temperatures (20◦C and 30◦C). With the aid of the Van’t Hoff equation, the enthalpy of solution of benzoic acid at those temperatures was determined as 10.82 KJ. This compares well with the value of 10.27KJ found in the literature. Introduction Solubility is a chemical property that is measured in terms of the maximum amount of solute dissolved in

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    Carbonate (CaCO3) in combination with Hydrochloric acid (HCl) upon its rate of reaction. CaCO3, commonly referred to as limestone, is an organic substance and is, in a sense, the crystallised “carbonic salt” of the element, calcium2. In addition to being a salt, the pH level of Calcium Carbonate is 9.91, and it is therefore, a basic substance, due to the fact that it is comprised of a pH level higher than 7, which is neutral3. HCl, however, is the bodily acid found in the stomach of human beings. It is

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    Amino Acids Lab Report

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    corresponds with the amino acid arginine. This was repeated for each trial of each leaf and the amino acids were identified. Retention factors and closest corresponding amino acids Rf (A) Nandina domestica Amino acid Buxus sempervirens Amino acid Stachys byzantina Amino acid Trial 1 0.200 arginine 0 none 0 none Trial 2 0.345 threonine 0.257 glycine 0 none Trial 3 0.186 arginine

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    the difference between the enzyme activities when phosphorus is used and when arsenic is used. As you can tell, the enzyme activity decreases when arsenic is added. At the level of the Krebs cycle, it primarily inhibits enzymes that require lipoic acid as a cofactor, such as pyruvate and alpha-ketogluterate dehydrogenase. This then inhibits the Krebs Cycle, which stops the production of reduced NAD (NADH). Therefore, arsenic poisoning kills by allosteric inhibition of essential metabolic enzymes

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    1. Aims a) To find the molar absorptivity of salicylic acid by plotting a graph of absorbance against the concentration of salicylic acid, using the standard solution. b) To find the concentration of aspirin at the various time intervals using the molar absorptivity value in the previous part, initial concentration of aspirin and the concentration of salicylic acid obtained from the decomposition of the aspirin pill. c) Lastly, to calculate the rate constant of the decomposition of aspirin by plotting

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    Unknown Solid Acid

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    Purpose: The purpose of this lab is to titrate an unknown solid acid (KH2PO4) with a standardized sodium hydroxide solution. After recording and plotting the data, the acid’s equivalence point will be recorded once the color changes. Using the equivalence point, the halfway point will be calculated, which is used to determine the acid’s equilibrium constant. The acid’s calculated equilibrium constant will be compared with the acid’s established pKa value. Eventually using the NaOH and the acid’s

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    Discussion: End point in this acid-base titration experiment refers to the point where the chemical reaction has reached its conclusion and no additional titrant should be added. The end point of this experiment can be obtained when the indicator used changes colour. For example colourless to light pink when phenolphthalein is used and red to orange and subsequently yellow when methyl orange is used. Equivalence point, also known as stoichiometric point in an acid-base titration refers to the point

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    Acid Rain Essay

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    INTRODUCTION Acid rain or also known as acid deposition are divided into two that is wet deposition and dry deposition. Wet deposition is what always be called as acid rain. Acid rain is a term that any form of precipitation with acidic component, such as sulphuric or nitric acid. Example of acid rain form were rain, snow, fog, hail or even dust that is acidic. Acid rain occur when sulphur dioxide (SO2) and nitrogen oxides (NOX) are emitted into the atmosphere and transported by wind and air currents

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    Hydrochloric Acid Essay

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    Hydrochloric acid is a colorless, clear, highly corrosive liquid that can cause burning. Hydrochloric acid is a very good industrial acid; it’s good for pickling iron and steel. Hydrochloric is found naturally in the stomach with the other gastric juices. Hydrochloric acid plays a role in the digestion of the food, and releasing enzymes in the stomach. Hydrochloric acid is found with the other gastric juices which are mostly potassium chloride, and sodium chloride. Hydrochloric acid is made up 5%

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    The term "Acid Rain" is a broad term that is used to emphasize on the fact that the rain has become acidic using certain pollutants, which may appear in different forms. For example, the dry deposition is when gases and dust particles become acidic, being able to affect a person 's health by inhaling it. On the other side, wet deposition is when it rains, polluting the trees and lakes. Acid rain is a result of two different sources; first is natural sources, such as decaying vegetation and volcanoes

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    of excessive stomach acid (FACEP). The normal pH of the esophagus is around 7 (Tutuian), and the pH of stomach acid is between 1.5 and 3.5 (“Stomach acid test.”). The pH of the esophagus shifts to 4 when acid reflux occurs meaning that it became more acidic. The acid in the stomach is important for digestion and for the immune system. The acid helps break up food and proteins, while protecting the body from any germs and bacteria that are in foods or liquids consumed. The acid also promotes and supports

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    experiment acid base indicators will be tested, using a red cabbage mixture. Substances can be classified as acidic or alkalinic depending on the concentration of hydrogen or hydroxide ions. The higher the concentration of hydrogen ions the lower the pH this means it will be an acid and the higher the concentration of hydroxide ions the higher the pH this means it will be an base(science prof online). A pH indicator is a solution or mixture that changes colour in the presence of an acid or base. Red

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