Chapter 13: EDTA titrations Complexation Reaction: A reaction between two species having a well-defined stoichiometry. The resulting bond is not permanent from a covalent standpoint. Complex: The resulting structure formed during a complexation reaction. Coordination Center: Metal ion in a complex (Lewis acid) Ligand: The species that complexes the metal center. A single species can form one or more bonds with a single coordination center (Lewis base) Coordination Number: Number of ligand bonds
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Experiment #10 & #11 The Synthesis of Cobalt Oxalate Hydrate The Synthesis of a Nitrite Complex February 5‚ 2012 Chemistry 1211L - 146 - Spring 2012 Procedure The Synthesis of Cobalt Oxalate Hydrate Place 100 ml of distilled water in a 250-ml (or 400-ml) beaker. Add 1.26g of oxalic acid dihydrate (H2C2O4.2H2O) and 1 ml of concentrated ammonia. Stir the mixture until the solid has dissolved completely. Dissolve 2.34 g of cobalt chloride hexahydrate (CoCl2.6H2O) in 100 ml of water
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known starting mass of magnesium and the measured collection of hydrogen gas will be used to determine the reaction stoichiometry and the valency of magnesium. Introduction: In Chemistry‚ stoichiometry is the study of the quantitative relationship between amounts of reactants and products of a reaction (that is‚ how many moles of A react with a given number of moles B). Stoichiometry refers to the relative number of atoms of various elements found in chemical substances and is often useful in characterizing
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masked by Na+) - Ca+ = Brick Red - H4N+ = no color Cobaltnitrite test for K+: -Heat NH4+ off -In a small test tube/vial‚ or spot plate and place 10-15 drops of solution to test -Then add a drop of 6M HAc and 2-3 drops of sodium cobaltnitrite reagent -Observe - ppt forms = K+ and/or H4N+ - no ppt = No K+ or H4N+ Blue Litmus test for H4N+: -Mix the sample in DIW -Add 6M NaOH -Suspend damp red litmus -Observe - red litmus turns blue = H4N+ pH test: -Test sample solution with Indicators
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terms are found in Chapters 2 and 3): a) c) e) g) i) k) m) o) 3. b) d) f) h) j) l) n) compound physical change law of conservation of mass extensive properties accuracy stoichiometry Avogadro’s number Convert a) b) c) d) e) f) g) h) 4. element solution chemical change intensive properties precision isotopes the mole limiting reactant 5 feet 10 inches to meters 55 miles per hour to cm per second 5.0 quarts to liters 1.00 ft2 to cm2 32.06 amu to g 25 g of carbon to moles of carbon 1.00 g of gold
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barium chloride as a reagent to precipitate sulfate from the dissolved sample. The mass of sulfate in the sample can be calculated by simple stoichiometry from the mass of the weighing form of the sulfate precipitate. In order to ensure maximum filterability and minimum contamination‚ the sulfate is precipitated under conditions that maximize the particle size. These conditions include: (a) avoiding excessively high concentrations of precipitating reagent; (b) slow addition of reagent to a hot solution
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43.3 Mass of dry product 0.9 g 2.00 3.00 Calculations 1. Determine the limiting reagent for each trial. Show your calculations. (Hint: See the example in the Introduction.) Example: Trial 1: Note: These should be about the same and either CaCl2 or K2CO3 can be the limiting reagent depending on their initial masses. Trial 2: Table 3: Comparison of theoretical and actual yields for CaCO3 Trial # Limiting Reagent Theoretical Yield of CaCO3 Actual Yield of CaCO3 % Yield Trial 1
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Solution Review Complete all questions in this package. Be careful to use correct significant figures and units for any calculation problems. For all chemical equations use phase subscripts. Concentration 1. Calculate the concentration of the solution formed when 23.61 g of sodium phosphate is dissolved in 475.0 cm3 of water. 2. What volume of water is needed to dissolve 85.8 g of silver nitrate to make a 2.650 M solution? 3. What mass of magnesium sulphate is needed to make 1500
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Experiment 1 Calorimetry Chem 17 Univerity of the Philippines Diliman Discussion All chemical reactions involve energy. By understanding the behavior and connection of energy flow within a chemical reaction‚ we can understand and manipulate them to our advantage. The most common form of energy observed during chemical reactions is heat. The reaction may absorb (endothermic) or release (exothermic) heat‚ depending on the reacting substances. Calorimetry is the process of measuring the heat flow
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Basic Stoichiometry PhET Lab Let’s make some sandviches! Introduction: When we bake/cook something‚ we use a specific amount of each ingredient. Imagine if you made a batch of cookies and used way too many eggs‚ or not enough sugar. YUCK! In chemistry‚ reactions proceed with very specific recipes. The study of these recipes is stoichiometry. When the reactants are present in the correct amounts‚ the reaction will produce products. What happens if there are more or less of some of the reactants
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