alkalinity‚ in this experiment we obtained a 17.6 % alkalinity with an error of 15.14% In the analysis of a carbonate-bicarbonate mixture two indicators (phenolphthalein and methyl orange) were used. The first endpoint determines the half-neutralization of the carbonate and the second determines that of the bicarbonate. The experiment results to an analysis of 4.92% carbonate and 5.07% bicarbonate content in the unknown sample. Introduction Soda ash or sodium carbonate is a sodium salt of carbonic
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Bibliography: 1) http://en.wikipedia.org/wiki/Celsius 2) http://en.wikipedia.org/wiki/Fahrenheit 3) http://www.sciencelearn.org.nz/Contexts/Fire/Science-Ideas-and-Concepts/Heat-energy 4) http://en.wikipedia.org/wiki/Freezing-point_depression 5) http://www.freedrinkingwater.com/resource-water-chemistry.htm Many thanks to: Our respective parents who funded this study To the almighty God To the teachers who we bothered and
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Chemical T ests for Unknowns Chemical tests have been developed as a means of identifying what functional groups are present in an unknown compound. Since IR and NMR spectroscopy has been developed‚ they are no longer critical to unknown analysis‚ but they can still be useful for confirming what you have determined by spectroscopy. Some of them look cool too! In order for a chemical reaction to work as a chemical test‚ it must 1) create a visible result (a color change‚ a precipitate‚ etc)
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A. Goal and Purpose: Session 1: In this lab‚ we will achieve a simple Friedel-Crafts alkylation of anthracene. The choice of anthracene as an aromatic substrate stems from two considerations. First‚ there is a question of regioselectivity. Second‚ anthracene and its derivatives are highly visible under UV light. Session 2: In this lab‚ we will complete a partial conversion of 9-acetylanthracene using m-chloroperoxybenzoic acid (mCPBA). We will also determine by NMR‚ the regiochemistry of the
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O2H22 ─ E. Ca2+‚ OH ─ Answer: E 4.9 The distinguishing characteristic of all electrolyte solutions is that they: E A. contain molecules B. conduct electricity C. react with other solutions D. always contain acids E. conduct heat Answer: B 4.10 According to the solubility rules‚ which one of the following compounds is insoluble E in water? A. NaCl B. MgBr2 C. FeCl2 D. AgBr E. ZnCl2 Answer: D 4.11 According to the solubility
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Almero‚ K. J. Date Due: 3 July 2013 Dante‚ R. A. Date Submitted: 3 July 2013 EXPERIMENT NO. 3 DENATURATION OF PROTEINS Abstract The experiment aimed to use the concept of viscosity to study the effects
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ions. H2PO4- (aq) H+ (aq) + HPO4-2 (aq) If a small amount of base is added to this system‚ which of the following reactions occurs in order to neutralize the base? Answer(H2PO4- (aq) + OH- (aq) HPO4-2 (aq) + H2O (l) ) Question= Neutralization reactions typically occur between a strong acid and a strong base to produce a salt and water question When sodium carbonate (Na2CO3) dissolves in water‚ it partially ionizes. The carbonate (CO3-) ion takes up a hydrogen ion and forms
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Chapter 5: Solutions‚ Colloids‚ and Membranes Chapter Summary Mixtures and Solutions * A mixture maintains its identity regardless of the proportions of its components. * A mixture can be separated into its pure components through physical separation techniques. * The components are distributed uniformly throughout a homogenous mixture. * The components are not distributed uniformly throughout a heterogeneous mixture. * A solution is composed of a solvent and one or more solutes
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study the effect of changes in environmental conditions on the permeability of living beetroot cells. Materials and Equipment: Scalpel Tweezers Safety Goggles Cork Borer 3-4 Beetroots Small Beaker Test tube Rack 7 Test Tubes (The Effect of Heat) Hot Plate 10ml of 0.1M HCl 10ml of 0.01 M HCl 10ml of 0.001 M HCl 10ml of 0.001 M NaCl 10ml 0f 0.01 M NaCl 10ml of 0.1 M NaCl 10ml of tap water 9 Test Tubes (The Effect of pH) Graduated Cylinder 6 Discs of Frozen Beetroots (3 per experiment)
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volume used‚ find the number of moles of each used to produce the maximum temperature. nMOH+ H(11)X = . A) Find the number of moles of base used per mole of acid. B) find the heat of reaction (Delta H) in kilocalories (kcal) per mole of bas used‚ assuming the specific heat of the solution to be 1.00 Cal/degree-gram and the density of the solution to be 1.00 g/ml. use the delta t for the run nearest to that producing a maximum temperature in which there is an excess of acid
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