the mass of water and dividing it by the total mass of the hydrate and then multiplying that answer by 100%. The number of moles of water in a hydrate was determined by taking the mass of the water released and dividing it by the molar mass of water. The number of moles of water and the number of moles of the hydrate was used to calculate the ratio of moles of water to moles of the sample. This ratio was then used to write the new and balanced equation of the dehydration process. The sample was then
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A. INTRODUCTION Biochemistry is the chemistry of biological systems. The practical component of biochemistry is aimed at developing your interest in and understanding modern biochemical and molecular biological experimentation. The techniques learnt in the biochemistry lab will be applicable to all life sciences. THE OBJECTIVES OF THE BIOCHEMISTRY LABORATORY INCLUDE: (1) Learning the theory behind the techniques and biochemical pathways (2) Learning the physical skills and techniques of
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Unit Conversions Tutorial Tools to help us with unit conversions are called conversion factors. Most books have tables either in the front or as appendices in the back with all different kinds of conversions factors‚ such as from one unit system to another (Metric to English) or within the same unit system. Unit analysis technique Step 1. Get the conversion factors needed. Step 2. Draw lines to create boxes Column 1 | Column 2 | Column 3 | 1 | 3 | 5 | 2 | 4 | 6 | Note: Depending
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the equation. Convert units of a given substance to moles. Using the mole ratio‚ calculate the moles of substance yielded by the reaction. Convert moles of wanted substance to desired units. Converting from Grams to Moles NOTE: One mole of anything contains 6.022 x 1023 atoms Atomic weights on the periodic table are given in terms of amu (atomic mass units)‚ but‚ by design‚ amu correspond to the gram formula mass. In other words‚ a mole of a 12 amu carbon atom will weigh 12 grams. The gram
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Quantitative Chemistry –Titration Determination of the Molarity of an Unknown Solution through Acid-Base Titration Technique 1. Introduction 1.1 Aim The aim of this investigation was to determine the precise molarity of two (NaOH(aq)) sodium hydroxide solutions produced at the beginning of the experiment through the acid-base titration technique. 1.2 Theoretical Background Titration is a method commonly used in laboratory investigations to carry out chemical analysis
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. Tf = Kfmsolute Kf = Tf/msolute where msolute equals the molality of the solute. What is the molality of the solute? msolute=molality of solute = moles of solute/kg solvent moles of solute = 1.00 g 1‚4-DCB/146.9 g/mol = 6.81 x 10-3 moles 1‚4-DCB kg of solvent = 10.00 g naphthalene/1000 g/kg = 0.01 kg solvent msolute = 6.81 x 10-3 moles 1‚4-DCB/0.01 kg naphthalene = 0.681 m Kf = 2.8°C/0.681 m = 4.112 K·kg/mol The actual value for Kf for naphthalene is 7.45 K·kg/mol‚ so we’re a fair amount
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constant. a. What is a mole? mole (mol): the SI unit used to measure the amount of a substance‚ number of representative particles. representative particle: any kind of particle such as atoms‚ molecules‚ formula units‚ electrons‚ or ions. Avogadro’s number: 6.022 136 7 x 10²³‚ volume of one mole of a gas determined by Amedeo Avagadro in 1811. B. Converting Moles to Particles and Partciles to Moles number of moles x 6.02 x 10²³ representative particles /1 mole = number of representative
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Title: Spectrophotometric analysis of a two-component mixture Aim: i. To prepare working standards of dichromate and permanganate ii. To measure the absorbance of the prepared working standards of dichromate and permanganate using a spectrophototometer iii. To determine the concentrations of permanganate in a mixture of unknown. Abstract: Working standards of dichromate and permanganate were prepared and absorbance for each found. This was done in order to plot
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Determination of the Composition of Cobalt Oxalate Hydrate Experiment 12 Robbie Kinsey Partner: Debnil Chowdhury Chem. 1312-D TA’s: Russell Dondero & Sylvester Mosley February 9‚ 2000 Purpose The purpose of this lab was to determine the percent cobalt and oxalate by mass‚ and with that information‚ the empirical formula for cobalt oxalate hydrate‚ using the general formula Coa(C2O4)b.cH2O. Procedure The powdered cobalt oxalate
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Last Name ____________________First Name _______________________ Ignore: 5‚ 7‚ 19‚ 30 1. | How many grams of CaCl2 (molar mass = 111.0 g/mol) are needed to prepare 4.44 L of 0.500 M CaCl2 solution? | | A) 369 g B) 271 g C) 258 g D) 296 g E) 246 g | 2. | An aqueous solution of ammonium sulfate is allowed to react with an aqueous solution of lead(II) nitrate.The complete ionic equation contains which of the following species (when balanced in standard form)? | | A)
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