Wednesday, April 3, 2019

Synthesis of Chloropentaamminecobalt (iii) Chloride

Synthesis of Chloropentaammoecobalt (iii) ChlorideIntroductionCobalt was sight by Georg Brandt in 1735 interestingly the name Cobalt originates form the German word Kobald which means goblin or evil spirit. The original usance of cobalt was value to early civilisation of Egypt for colouring glass blue. Alf departure Werner was a pioneer in coordination Chemistry determined the isomer cobalt (III) hexamine chloride.Experimentalammonium chloride (1.306g) was turn in concentrate ammonium hydroxide solution (10.5cm3) forming a pallid solution. Colablt(II)chloride hexahydrate (2.494g) was added in small portions with t stirring producing a muddy liquidness with a dark go down. 27% henry peroxide (2.25cm3) was added using a dropping pipette with changeless stirring. A small amount of heat and effervescence (bubbling) was visible. Once the reaction has stopped and a dark red solution was formed to which suffer Hydrochloric acid (10cm3) was added very slowly with constant stirring . A large amount of heat was released and a white spatter was given off forming a dark pink solution. This solution was het up(p) for 18mins before being cooled in ice forming dark pink precipitate. The solution was filtered and washed with dilute hydrochloric acid (5cm3) ethanol (5cm3) and acetone (5.5cm3). Once modify the crystals (1.447g %) were transferred to an open sample vial and dried in a desiccator for a week.A portion of this point of intersection (g) was dissolved in Dilute ammonia (10cm3), urine (40cm3) was added. The solution was change (15 mins) forming a clear red solution. Concentrate Hydrochloric acid ( 10cm3) was added followed by ammonium ion chloride (1.00g) forming a orange solution. The resulting solution was heated for a further 25mins. COLOURS . Solution was cooled in ice and the product filtered off and washed with hydrochloric acid (5cm3) ethanol (5cm3) and acetone (5.5cm3). Forming 0.g %)Ammonium chloride(5.02g), Cobalt(II) chloride hexahydrate(1. 396g) and atomic number 11 Iodide (0.192g) were dissolved Water (10cm3) producing a deep pink purple colour. powdery iodine (0.718g) was added forming a colour. Concentrate Ammonia (5.2cm3) was added with stirring forming a barge muddy brown grey then turned greyer on afterward a further 30mins of stirring. The resulting solution was left to stand for 1 min and then the liquid was decanted off, water (20cm3) was added and decanted off and then Ethanol (20cm3). The resulting precipitate was dried under suction with further Ethanol washings (15cm3) producing (1.404g %)Ammonium Chloride (1.0g) was dissolved in Boling water (3.5cm3). Cobalt(II) chloride hexahydrate (1.548g) was added producing a deep royal blue solution. charcoal grey (?0.75g) was added turning the solution grey black. The solution was cooled in an ice privy to 5oC and Concentrate Ammonia (4.5cm3) was added in small portions over 3 mins. Hydrogen peroxide (23% vol) (4cm3) was added in portions over 5 mins. The sol ution was then heated to 60oC for 1 min. The solution was re cooled to 3oC in an ice bath. The black oleaginous precipitate was filtered under suction before being added to Boiling water (12cm3). Concentrate Hydrochloric acid (0.5cm3) was added and then the solution filtered. Concentrate Hydrochloric acid (2cm3) was added to the try (liquid) and the solution cooled in ice. The resulting orange precipitate was filtered and washed with acetone (10cm3) producing (0.444g %)Results and give-and-takeEquationsM= Molar Conductivity (S m2 groin L-1)= Measured conductivity (units S m-1)c = Concentration (units seawall m3)A mol L-1 = A x100 mol m3A S cm-1= (A /10000) S m-1n=M/Mrn= MolesM= Mass (units grams)Mr = Molecular weightn= C x Vn = molesC = Concentration (units mol L-1)V= Volume (L)100cm3= 0.1L set of Chloropentaamminecobalt (III) chlorideAmmonium chloride +Ammonia+ Cobalt (II) chloride hexahydrate Chloropentaamminecobalt (III) chlorideNH4Cl + CoCl2.6H2O + NH3 Co(NH3)5ClCl2Calcul ation of Concentration of Chloropentaamminecobalt(III) chloride in 100cm3 volumetric flaskn=M/MrM= 0.1100gMr Chloropentaaminecobalt(III) chloride = 267.4762n = 0.1100/267.4762n= 4.112543110-4n=CV4.1125431 x10-4= C x 0.1C= 4.1125 x10-3mol L-1 0.41125 mol m3Conductivity = 1286S 0.1286 S m-1S m2 mol L-1Preparation of iodopentaaminecobalt(III) chlorideIodine + Cobalt(II) Chloride hexahydrate + Ammonia+ Ammonium chloride Iodopenaaminecobalt(III) chlorideI2 + CoCl2.6H2O + NH4Cl + NH3 Co(NH3)5ICl2n=M/MrM= 0.0934gMr iodopentaaminecobalt(III) chloride = 341.90n = 0.0934/341.90n= 2.73179 x10-4n=CV2.7317910-4= C x 0.1C= 2.7317929 x10-3mol L-1 0.27317929 mol m3Conductivity = 1137S 0.1137 S m-1S m2 mol L-1Preparation of hexaaminecobalt(III) chlorideAmmonium chloride + Cobalt(II) chloride hexahydrate +Ammonia Hexaamminecobalt(III) chloride.NH4Cl + CoCl2.6H2O+ NH3 Co(NH3)6Cl3n=M/MrM= 0.1010gMr Hexaamminecobalt(III) chloride =267.4762n = 0.1010/267.4762n= 3.776036896 x10-4n=CV3.776036896 x10 -4= C x 0.1C= 3.776036896 x10-3mol L-1 0.3776036896 mol m3Conductivity = 1720S 0.1720 S m-1S m2 mol L-1

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