Report on cobalt (III) ammine complexes Example For Students

Report on cobalt (III) ammine complexes Outline1 Introduction2 Experimental3 Consequences and treatment4 Equations5 Preparation of Chloropentaamminecobalt ( III ) chloride6 Calculation of Concentration of Chloropentaamminecobalt ( III ) chloride in 100cm3 volumetric flask7 Preparation of iodopentaaminecobalt ( III ) chloride8 Preparation of hexaaminecobalt ( III ) chloride Introduction Cobalt was discovered by Georg Brandt in 1735 interestingly the name Cobalt originates form the German word Kobald which means hob or evil spirit. The original usage of Co was value to early civilization of Egypt for coloring glass blue. Alfred Werner was a innovator in coordination Chemistry determined the isomer Co ( III ) hexamine chloride. Experimental Ammonium chloride ( 1.306g ) was dissolved in dressed ore ammonium hydroxide solution ( 10.5cm3 ) organizing a colorless solution. Colablt ( II ) chloride hexahydrate ( 2.494g ) was added in little parts with t stirring bring forthing a boggy liquid with a dark precipitate. 27 % Hydrogen peroxide ( 2.25cm3 ) was added utilizing a dropping pipette with changeless stirring. A little sum of heat and effervescence ( bubbling ) was seeable. Once the reaction has stopped and a dark ruddy solution was formed to which Concentrate Hydrochloric acid ( 10cm3 ) was added really easy with changeless stirring. A big sum of heat was released and a white gas was given off organizing a dark pink solution. This solution was heated for 18mins before being cooled in ice organizing dark pink precipitate. The solution was filtered and washed with dilute hydrochloric acid ( 5cm3 ) ethyl alcohol ( 5cm3 ) and propanone ( 5.5cm3 ) . Once dry the crystals ( 1.447g? ? % ) were transferred to an unfastened sampl e phial and dried in a desiccator for a hebdomad. A part of this merchandise ( ? ? ? g ) was dissolved in Dilute ammonium hydroxide ( 10cm3 ) , H2O ( 40cm3 ) was added. The solution was heated ( 15 mins ) organizing a clear ruddy solution. Concentrate Hydrochloric acid ( 10cm3 ) was added followed by Ammonium chloride ( 1.00g ) organizing a orange solution. The ensuing solution was heated for a farther 25mins. Color? ? . Solution was cooled in ice and the merchandise filtered away and washed with hydrochloric acid ( 5cm3 ) ethyl alcohol ( 5cm3 ) and propanone ( 5.5cm3 ) . Forming 0. ? ? g? ? % ) Ammonium chloride ( 5.02g ) , Cobalt ( II ) chloride hexahydrate ( 1.396g ) and Sodium Iodide ( 0.192g ) were dissolved Water ( 10cm3 ) bring forthing a deep pink violet coloring material. Powdered I ( 0.718g ) was added organizing a? ? ? ? ? ? coloring material. Concentrate Ammonia ( 5.2cm3 ) was added with stirring organizing a light muddy brown Grey so turned greyer on after a farther 30mins of stirring. The ensuing solution was left to stand for 1 min and so the liquid was decanted off, H2O ( 20cm3 ) was added and decanted away and so Ethanol ( 20cm3 ) . The ensuing precipitate was dried under suction with farther Ethanol lavations ( 15cm3 ) bring forthing ( 1.404g? ? % ) Ammonium Chloride ( 1.0g ) was dissolved in Boling H2O ( 3.5cm3 ) . Cobalt ( II ) chloride hexahydrate ( 1.548g ) was added bring forthing a deep royal bluish solution. Charcoal ( ? 0.75g ) was added turning the solution Grey black. The solution was cooled in an ice bath to 5oC and Concentrate Ammonia ( 4.5cm3 ) was added in little parts over 3 mins. Hydrogen peroxide ( 23 % vol ) ( 4cm3 ) was added in parts over 5 mins. The solution was so heated to 60oC for 1 min. The solution was re cooled to 3oC in an ice bath. The black oily precipitate was filtered under suction before being added to Boiling H2O ( 12cm3 ) . Concentrate Hydrochloric acid ( 0.5cm3 ) was added and so the solution filtered. Concentrate Hydrochloric acid ( 2cm3 ) was added to the filtrate ( liquid ) and the solution cooled in ice. The ensuing orange precipitate was filtered and washed with propanone ( 10cm3 ) bring forthing ( 0.444g? ? % ) Consequences and treatment Equations A ; Delta ; M= Molar Conductivity ( S m2 mol L-1 ) = Measured conduction ( units S Garand rifle ) degree Celsiuss = Concentration ( units mol M3 ) A mol L-1 = A x100 mol M3 A Â µS cm-1= ( A /10000 ) S Garand rifle n=M/Mr n= Gram molecules .u07e26d92ae1f02ce7f9cf59ebc475df4 , .u07e26d92ae1f02ce7f9cf59ebc475df4 .postImageUrl , .u07e26d92ae1f02ce7f9cf59ebc475df4 .centered-text-area { min-height: 80px; position: relative; } .u07e26d92ae1f02ce7f9cf59ebc475df4 , .u07e26d92ae1f02ce7f9cf59ebc475df4:hover , .u07e26d92ae1f02ce7f9cf59ebc475df4:visited , .u07e26d92ae1f02ce7f9cf59ebc475df4:active { border:0!important; } .u07e26d92ae1f02ce7f9cf59ebc475df4 .clearfix:after { content: ""; display: table; clear: both; } .u07e26d92ae1f02ce7f9cf59ebc475df4 { display: block; transition: background-color 250ms; webkit-transition: background-color 250ms; width: 100%; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #95A5A6; } .u07e26d92ae1f02ce7f9cf59ebc475df4:active , .u07e26d92ae1f02ce7f9cf59ebc475df4:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #2C3E50; } .u07e26d92ae1f02ce7f9cf59ebc475df4 .centered-text-area { width: 100%; position: relative ; } .u07e26d92ae1f02ce7f9cf59ebc475df4 .ctaText { border-bottom: 0 solid #fff; color: #2980B9; font-size: 16px; font-weight: bold; margin: 0; padding: 0; text-decoration: underline; } .u07e26d92ae1f02ce7f9cf59ebc475df4 .postTitle { color: #FFFFFF; font-size: 16px; font-weight: 600; margin: 0; padding: 0; width: 100%; } .u07e26d92ae1f02ce7f9cf59ebc475df4 .ctaButton { background-color: #7F8C8D!important; color: #2980B9; border: none; border-radius: 3px; box-shadow: none; font-size: 14px; font-weight: bold; line-height: 26px; moz-border-radius: 3px; text-align: center; text-decoration: none; text-shadow: none; width: 80px; min-height: 80px; background: url(https://artscolumbia.org/wp-content/plugins/intelly-related-posts/assets/images/simple-arrow.png)no-repeat; position: absolute; right: 0; top: 0; } .u07e26d92ae1f02ce7f9cf59ebc475df4:hover .ctaButton { background-color: #34495E!important; } .u07e26d92ae1f02ce7f9cf59ebc475df4 .centered-text { display: table; height: 80px; padding-left : 18px; top: 0; } .u07e26d92ae1f02ce7f9cf59ebc475df4 .u07e26d92ae1f02ce7f9cf59ebc475df4-content { display: table-cell; margin: 0; padding: 0; padding-right: 108px; position: relative; vertical-align: middle; width: 100%; } .u07e26d92ae1f02ce7f9cf59ebc475df4:after { content: ""; display: block; clear: both; } READ: The 1930s: The Good Times And The Bad Times EssayM= Mass ( units gms ) Mr = Molecular weight n= C x V n = moles C = Concentration ( units mol L-1 ) V= Volume ( L ) 100cm3= 0.1L Preparation of Chloropentaamminecobalt ( III ) chloride Ammonium chloride +Ammonia+ Cobalt ( II ) chloride hexahydrate A ; agrave ; Chloropentaamminecobalt ( III ) chloride NH4Cl + CoCl2.6H2O + NH3 A ; agrave ; Cl2 Calculation of Concentration of Chloropentaamminecobalt ( III ) chloride in 100cm3 volumetric flask n=M/Mr M= 0.1100g Mr Chloropentaaminecobalt ( III ) chloride = 267.4762 n = 0.1100/267.4762 n= 4.112543110-4 n=CV 4.1125431 x10-4= C x 0.1 C= 4.1125 x10-3mol L-1 A ; agrave ; 0.41125 mol M3 Conductivity = 1286Â µS A ; agrave ; 0.1286 S Garand rifle S m2 mol L-1 Preparation of iodopentaaminecobalt ( III ) chloride Iodine + Cobalt ( II ) Chloride hexahydrate + Ammonia+ Ammonium chloride A ; agrave ; Iodopenaaminecobalt ( III ) chloride I2 + CoCl2.6H2O + NH4Cl + NH3 A ; agrave ; Cl2 n=M/Mr M= 0.0934g Mr iodopentaaminecobalt ( III ) chloride = 341.90 n = 0.0934/341.90 n= 2.73179 x10-4 n=CV 2.7317910-4= C x 0.1 C= 2.7317929 x10-3mol L-1 A ; agrave ; 0.27317929 mol M3 Conductivity = 1137Â µS A ; agrave ; 0.1137 S Garand rifle S m2 mol L-1 Preparation of hexaaminecobalt ( III ) chloride Ammonium chloride + Cobalt ( II ) chloride hexahydrate +Ammonia A ; agrave ; Hexaamminecobalt ( III ) chloride. NH4Cl + CoCl2.6H2O+ NH3 A ; agrave ; Co ( NH3 ) 6 ] Cl3 n=M/Mr M= 0.1010g Mr Hexaamminecobalt ( III ) chloride =267.4762 n = 0.1010/267.4762 n= 3.776036896 x10-4 n=CV 3.776036896 x10-4= C x 0.1 C= 3.776036896 x10-3mol L-1 A ; agrave ; 0.3776036896 mol M3 Conductivity = 1720Â µS A ; agrave ; 0.1720 S Garand rifle S m2 mol L-1