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Category: Chemistry

Experiments under the department of Chemistry

Synthesis of Tris(ethylenediamine)cobalt(iii) chloride

Synthesis of Tris(ethylenediamine)cobalt(iii) chloride

Introduction      Tris(Ethylenediamine)cobalt(III) chloride is coordination compound with the formula [Co(en)3]Cl3. Ethylenediamine coordinates with the cobalt ion through both nitrogen atoms, the five membered chelate rings that are thus formed are very stable. Aim of the Experiment      To synthesize tris(Ethylenediamine)cobalt(III) chloride and calculate the percent yield. Apparatus and Reagents Needed CoCl2.6H2O Ethylenediamine dihydrochloride Conc. HCl Water aspirator Weighing balance Hot plate Ice bath Beaker Water aspirator Vacuum filtration setup Sample bottle Stirring rod Procedures Weigh 6 g of CoCl2.6H2O to a…

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Synthesis of Tetraaminecopper(ii) Sulphate Monohydrate

Synthesis of Tetraaminecopper(ii) Sulphate Monohydrate

Introduction      Tetraaminecopper(II) sulphate monohydrate is an inorganic complex compound with the formula [Cu(NH3)4]SO4.H2O. In this experiment,tetraaminecopper(II) sulphate monohydrate is prepared from a reaction of CuSO4.5H2O and NH3 in aqueous solution. [Cu(H2O)4]SO4.H2O(aq) + 4 NH3(aq) → [Cu(NH3)4]SO4.H2O(aq) + 4H2O(l) This is a single replacement reaction in which NH3 molecules replace the water molecules originally bonded to the copper(II) ion. Aim of the Experiment      To synthesize tetraaminecopper(II) sulphate monohydrate and determine the percent yield. Apparatus and Reagents Needed Copper(II)sulphate pentahydrate, CuSO4.5H2O. Concentrated Ammonia Distilled Water Ethanol Test Tube…

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Synthesis of Hexaamminecobalt(iii) Chloride

Synthesis of Hexaamminecobalt(iii) Chloride

Introduction      Cobalt has the outer electronic configuration 3d7 4s2and common oxidation states of cobalt include +2 and +3, although compounds with oxidation states ranging from -3 to +5 are also known. Cobalt (III) salts are difficult to prepare due the fact that Co3+is a strong oxidizing agent and the chemistry of this oxidation state is largely that of coordination compounds. Co2+ ion is more stable than Co3+ ion for simple salts. The difficulty in this experiment is solved by air oxidation with…

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Determination of Percentage of Water in a Hydrate

Determination of Percentage of Water in a Hydrate

Introduction      Hydrates are compounds containing water molecules combined in a definite ratio as an integral part of the crystal. These hydrates are also said to contain water of crystallization or water of hydration. Each hydrate has a definite composition; a certain number of water molecules are combined with each formula unit of the salt. Examples of hydrates are: CuSO4•5H2O Copper(II) sulfate pentahydrate CoCl2 • 6H2O Cobalt (II) chloride hexahydrate ZnSO4 • 7H2O Zinc sulfate heptahydrate Objective of the Experiment This experiment is…

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Determination of Heat of Reaction from the Temperature Dependence of the Equilibrium Constant

Determination of Heat of Reaction from the Temperature Dependence of the Equilibrium Constant

Introduction The basis of this experiment is to determine the heat of reaction from the temperature dependence of equilibrium constant. The reaction basically involves dissolving borax Na2B4O7.10H2O in water. Borax is sparingly soluble in water and its solubility properties is calculated at different temperature .Quantities like enthalpy ∆H0, the entropy ∆S0, free energy ∆G0 as well as Ksp are determined for the reaction system. Saturated solution of borax are to be obtained, then it is subjected to further analysis. This makes the…

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Determination of Heat of Neutralization

Determination of Heat of Neutralization

Introduction      Thermochemistry deals with the experimental measurement and calculation of heat changes.Every chemical reaction is always accompanied by a change in energy usually in form of heat: a reaction will either give off heat (exothermic), or it will absorb heat (endothermic). Many times the heat transfer associated with a chemical reaction is more important than the reaction itself. The heat change that accompanies the reaction of one mole of substance is designated by the symbol Q. Heat changes for chemical…

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