EXPERIMENT 13: Extraction: Extraction with acid and alkali Objective 1. To recover the benzoic acid and p-dichlorobenzene from its mixture from its mixture by using acid-alkali extraction. 2. To determine the percentage recovery and melting point of the recovered benzoic acid and p-dichlorobenzene. Introduction Acid-base extraction is a process which purifying the acids and bases from mixtures based on their chemical properties. Acid-base extraction is performed to isolate the compounds and natural
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antacid for hyperchlorhydria • for intestinal toxemia CALCIUM-CONTAINING ANTACIDS • dependent upon their basic properties • raise stomach pH to 7 • constipating • found in combinations with magnesium antacids 1. CALCIUM CARBONATE • precipitated chalk • fast action • found in combinations with Mg antacids • in Lozenges and Oral suspension 2. TRIBASIC CALCIUM PHOSPHATE • Precipitated Calcium Phosphate‚ Tertiary Calcium
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Indiana University. (2010). Retrieved March 8‚ 2012‚ from Indiana University: http://www.indiana.edu/~nimsmsf/P215/p215notes/LabManual/Lab12.pdf Lehninger‚ A Schonheyder‚ F.‚ & Volqvartz‚ K. (2008). On the Activation of Pancreatic Lipase by Calcium Chloride at Varying pH. Acta Physiologica Scandinavica ‚ 62-69. Tortora‚ G. J.‚ & Anagnostakos‚ N. P. (1990). Principles of Anatomy and Physiology. New York: Harper & Row‚ Publishers.
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objects known as “scum”. Calcium ions are typically the most common contributing factor for water hardness so this experiment uses CaCO3 (Calcium Carbonate) to analyze the hardness of an unknown sample. A scale of water hardness identifies “soft” water with a value less than 60 ppm (parts per million) and “hard” water with a value more than 200 ppm. 3 mL of ammonia/ammonium chloride buffer (pH 10) is added to the mixture prior to the titration to capture the calcium metal ions so the indicator
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test the gases‚ otherwise you can use the standard set up) The limestone cycle: 1. Burn the limestone chip/ limestone powder in a test tube in a Bunsen flame → calcium oxide 2. Put calcium oxide in water → calcium hydroxide solution + left over limestone 3. Filter the leftover limestone 4. Blow bubbles using a straw into the calcium hydroxide solution → limestone Flame colors: (I copied a table from the internet because it isn’t in the book‚ the ones in red I’m pretty sure you have to know‚
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Introduction 3 3. Theory 4 4. Procedure 4 5. Results and Calculations 5 – 6 6. Discussion 7 7. Conclusion 7 8. References 8 1. SYNOPSIS The purpose of this experiment is to use the back titration method to determine the percentage of calcium carbonate in toothpaste. Instead of using standard titration methods where an acid is titrated directly using a standard solution of a base‚ back titration is used because the sample to be analysed‚ CaCO3 does not dissolve in water. Hydrochloric acid
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HUN1201 Exam III Study Guide Chapter 14 1) Fuel/energy needs for Physical Activity (different intensities)‚ during and post exercise -Adenosine triphosphate (ATP): o The energy-carrying molecule in the body (ATP must be generated continuously since muscles store only enough ATP for 1–3 secs of activity) -Creatine phosphate (CP): • Stores energy that can be used to make ATP • 3−15 seconds of maximal physical effort *(0-3 sec) 100% ATP/CP *(10-12 sec) 50% ATP/CP 50% Carbohydrates
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Energetics Worksheet 1. Calculate a value for the Lattice Energy of Calcium Chloride from the following data. Draw energy cycles Std. Enthalpy of Formation of CaCl2 = - 795 kJ/ mol Std. enthalpy of atomisation of calcium = + 177 kJ/mol Std. enthalpy of atomisation of Chlorine = +121 kJ/mol 1st ionisation energy of calcium = +590 kJ/mol 2nd ionisation energy of calcium = +1100 kJ/mol Electron Affinity of chlorine = -364 kJ/mol 2. Draw Born-Haber cycles and calculate the L.E. of Cu2O and CuO
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WORKSHEET MOLE By Sir Shah Murtaza Q1. Potassium reacts with water as shown in the equation. a. Describe what you would see when potassium reacts with water. b. A sample of 0.195 g of potassium was added to 500 cm3 of cold water. When the reaction was finished‚ 100 cm3 of 0.100mol/dm3 hydrochloric acid was added to form solution X. (i) Calculate the number of moles of hydroxide ions formed when the potassium was added to water. (ii) Calculate the
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Result of Observation Chemical name and symbol Physical appearance Cation of the compound Flame color NaNO3Sodium nitrate Colourless crystal Na+ Yellowish Orange NaClSodium chloride Colorless crystal Cl+ Yellowish Orange LiNO3Lithium nitrate Colorless crystal Li+ Red BaNO3Barium nitrate White crystal Ba² Bright yellow‚ lime yellow Sr(NO3) 2Strontium nitrate White crystal Sr² Dark red Cu(NO3)2Cupric nitrate Blue crystal Cu² Green‚ bluish green. Ca(NO3) 2Calcium nitrate White crystal Ca² Redish
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