Experiment # 4: Dissociation Constant Weak Acids Introduction: The dissociation constants of weak monoprotic acids were determined with the aid of a buffer and pH meter. Experiment: This experiment was performed according to the procedures as provided in the Chemistry 111B laboratory manual: Po‚ Henry and Senozan‚ N. "General Chemistry Experiments Chemistry 111B"‚ 8th Ed.‚ 2004 Hayden-McNeil Publishing‚ pp 80-88. To determine the dissociation constants of weak monoprotic acids (HX and HY)‚ a buffer
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to moles‚ moles to mass or mass to moles‚ and moles to volume or volume to moles. The number of units in a mole is 6.02 × 1023. This number is called Avogadro’s number in honour of Amedeo Avogadro. Full name‚ Lorenzo Romano Amedeo Carlo Avogadro was an Italian physicist‚ born in Italy on August 9‚ 1776. Avogadro graduated in law at the age of 31. He then dedicated himself to physics and mathematics and soon after starting teaching at a high school. In 1811‚ he published an article that contained his
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Lorenzo Romano Amedeo Carlo Avogadro di Quaregna e di Cerreto‚[1] Count of Quaregna and Cerreto (9 August 1776‚ Turin‚Piedmont – 9 July 1856) was an Italian scientist. He is most noted for his contributions to molecular theory‚ including what is known as Avogadro’s law. In tribute to him‚ the number of elementary entities (atoms‚ molecules‚ ions or other particles) in 1 mole of a substance‚ 6.02214179(30)×1023‚ is known as the Avogadro constant. Avogadro’s Law Avogadro’s law states that equal volumes
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(LEO/DJ) 17382/3 © UCLES 2010 [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 μ0 = 4π × 10 –7 H m–1 0 = 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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S53718/7 © UCLES 2004 [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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The spring constant Manuel Cereijido Fernández – UO237242 PL-4 -----------------------------------------------------------------------------------1. Objectives The main objective of this experiment was to determine the spring constant using the dynamic method. 2. Theoretical fundamentals On the one hand‚ when a spring oscillates‚ the movement which describes can be classify as a simple harmonic motion. Therefore‚ its position‚ velocity and acceleration equations respect the time will
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– The Constant Gardener In the article “The Constant Gardener: What the Movie Missed” by Sonia Shah‚ she talks about the issues and concerns of new drugs being tested on people in developing countries such as Latin America‚ Eastern Europe‚ Asia and Africa. In Shah’s essay she brings up two convincing arguments against these experiments. One argument Shah speaks on is that in the movie The Constant Gardener the seriousness of the possible danger in these experiments is not well depicted. She argues
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Ley de Boyle Ley de Boyle (designado a veces Ley de Boyle-Mariotte) es uno de leyes del gas y base de la derivación para ley ideal del gas‚ que describe la relación entre el producto presión y volumen dentro de a sistema cerrado como constante cuando sigue habiendo la temperatura y los topos en una medida fija; ambas entidades siguen siendo inverso proporcionales. Historia La ley de Boyle se nombra después del filósofo natural irlandés Roberto Boyle (Lismore‚ Condado Waterford‚ 1627-1691) quién
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Remarks before starting the analysis of the dataset Purpose of the case We have to study three competitors (Dubuque‚ Ball Park‚ Oscar Mayer) in the market of the hot dog. We want to know the impact of the variation of the price of one competitor (Ball Park) on the market share of another competitor (Dubuque). Origin of the dataset The dataset comes from "a scanner study conducted at grocery stores located in the western suburbs of Chicago". So we know that the data don’t represent the entire
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the value of sigma when year (t) is zero. The coefficient‚ represent the difference when the year is before and after the trade liberalization. The coefficient measure the change in sigma given one unit change in year‚ holding all other factors constant. The third coefficient measure the interaction term between Dr and t. Thus‚ for countries before trade liberalization (D=0) the model become The coefficients and represent the intercept and the slope for
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