One mole of marshmallows would cover the USA to a depth of 105‚000 km (6500 miles). If an Avogadro number of pennies were distributed evenly among the human inhabitants of earth‚ each man‚ woman‚ and child would have enough money to spend a million dollars every hour—day and night—and still have over half of it unspent at death. One guacamole is the amount of taco chip dip that can be made from an Avogadro number of avocados—plus appropriate quantities of tomatoes‚ onions‚ and chili. A train
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The pH of various mixtures and find the dissociation constant of acetic acid Chemistry (HL) Research Question: To determine the pH of various mixtures of sodium acetate and acetic acid in an aqueous solution and hence to find the dissociation constant of the acetic acid. Background: The mixture of sodium acetate and acetic acid in aqueous solution is a buffer solution. Buffer solutions are the solutions which resist a sudden change in the pH due to addition of small amounts of strong acid or base
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Spectrophotometric Determination of the Equilibrium Constant of a Reaction DEPARTMENT OF MATERIALS‚ METALLURGICAL AND MINING ENGINEERING‚ COLLEGE OF ENGINEERING July 26‚ 2012 ------------------------------------------------- ABSTRACT ------------------------------------------------- Before proceeding to test the next solution‚ we must first clean the cuvette‚ using similar steps earlier. First‚ we rinse with water‚ then with the solution‚ and then we fill it up and test
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Date Performed: September 9 ‚2011 SPECTROPHOTOMETRIC DETERMINATION OF THE ACID DISSOCIATION CONSTANT OF METHYL RED M.C. Caligagan ‚M.N.Q. Tolentino and M.Q. Clores Institute of Chemistry‚ College of Science University of the Philippines‚ Diliman‚ Quezon City‚ Philippines Received :September 21‚2011 ABSTRACT This experiment aims to determine the acid dissociation constant value of Methyl Red by means of spectrophotometry. Ten samples were spectrophotometrically analyzed under a UV-Vis
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Number Lorenzo Romano Amedeo Carlo Avogadro was born in Turin‚ Italy‚ on 9th August‚ 1776. His family was very wealthy and popular among the people. Even though Avogadro’s family was mostly lawyers‚ he enjoyed private studies of mathematics and physics. His first scientific research in 1803 was on electricity. After John Dalton published his New System of Chemical Philosophy‚ more and more additions to the knowledge of chemistry were revealed. In 1811‚ Avogadro published an article in Journal de
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Synthesis of Salicylic Acid and Potentiometric Determination of its Purity and Dissociation Constant ------------------------------------------------- Abstract The purpose of the study is to synthesize salicylic acid from the ester‚ methyl salicylate‚ and determine the acid’s dissociation constant and purity. The ester was converted to salicylic acid by base hydrolysis. The products were refluxed and recrystallized‚ to ensure maximum purity‚ and filtered‚ dried‚ and weighed. The melting point
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Amedeo Avogadro was an Italian mathematician in the middle 1800’s. He devised a way of measuring the concentration of particles in a sample. Whether the sample is composed of atoms or molecules‚ he determined that the number of particles having a mass number matching the “atomic weight” was always 6.02 X 1023. In other words‚ if you had a sample of carbon with a mass of 12.011 grams‚ then you would have an Avogadro number of atoms. If you had a sample of water with a mass of 18.00 grams‚ then you
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speed of light in a vacuum c 3.00 × 108 m s–1 permittivity of free space ε0 8.85 × 10–12 C2 N–1 m–2 (F m–1) elementary charge e 1.60 × 10–19 C Planck constant h 6.63 × 10–34 J s gravitational constant G 6.67 × 10–11 N m2 kg–2 Avogadro constant NA 6.02 × 1023 mol–1 molar gas constant R 8.31 J mol–1 K–1 Boltzmann constant k 1.38 × 10–23 J K–1 electron rest mass me 9.11 × 10–31 kg proton rest mass mp 1.673 × 10–27 kg neutron rest mass mn 1.675 × 10–27 kg alpha particle
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⑀0 = 8.85 × 10 –12 F m–1 elementary charge‚ e = 1.60 × 10 –19 C the Planck constant‚ h = 6.63 × 10 –34 J s unified atomic mass constant‚ u = 1.66 × 10 –27 kg rest mass of electron‚ me = 9.11 × 10 –31 kg rest mass of proton‚ mp = 1.67 × 10 –27 kg molar gas constant‚ the Avogadro constant‚ R = 8.31 J K –1 mol –1 NA = 6.02 × 10 23 mol –1 the Boltzmann constant‚ k = 1.38 × 10 –23 J K –1 gravitational constant‚ G = 6.67 × 10 –11 N m 2 kg –2 acceleration of free fall‚ g = 9.81 m s –2
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S98413/3 © UCLES 2006 [Turn over 2 Data speed of light in free space‚ permeability of free space‚ permittivity of free space‚ elementary charge‚ the Planck constant‚ unified atomic mass constant‚ rest mass of electron‚ rest mass of proton‚ molar gas constant‚ the Avogadro constant‚ the Boltzmann constant‚ gravitational constant‚ acceleration of free fall‚ c = 3.00 × 10 8 m s –1 0 0 =4 × 10 –7 H m–1 = 8.85 × 10 –12 F m–1 e = 1.60 × 10 –19 C h = 6.63 × 10 –34 J s u = 1.66 × 10 –27
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