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LabReport.zipLab Analysis/#13 ANALYSIS.EXP.docx
Read the second part of the synthesis lab from the labs you have purchased.
Analysis of a Co-ordination Compound
NOTE: 1) The Gooch crucibles are already clean so skip the cleaning and start at weighing the Gooch crucibles. Return them with the AgCl in the crucible-DO NOT clean.
2) If you add the silver nitrate slowly you may form large particles of silver chloride which will filter faster. If the particles in solution are very small try heating the solution and then cooling by running tap water on the outside of the beaker.
Format
Abstract
Introduction - define
Empirical formula
Molecular formula
Percent composition
Precipitate
Formula Weight
Data - include
% Chlorine- Sample weight
Weight of Gooch crucible
Weight of Gooch crucible and AgCl
% Co Sample weight
Volume of Co2+ solution
Absorbance at analytical wave length
Analytical wave length
Calculations- % Chlorine - Calculate the experimental % Cl
Calculate the % Cl from the proposed formula
% Cobalt - Calculate the experimental % Co
Calculate the % Co from the proposed formula
or Calculate the ratio of Co/Cl from the experimental data and the formula
% NH3- Calculate the experimental % NH3 (by difference)
Calculate the % NH3 from the proposed formula
Limits on Results -
Conclusions - Does your data support the proposed formula? (Compare the theoretical and experimental elemental composition)
Questions - p 40 # 1
__MACOSX/Lab Analysis/._#13 ANALYSIS.EXP.docx
Lab Analysis/Data 1 .JPG
__MACOSX/Lab Analysis/._Data 1 .JPG
Lab Analysis/Data 2 .JPG
__MACOSX/Lab Analysis/._Data 2 .JPG
Lab Analysis/Data 3 .JPG
__MACOSX/Lab Analysis/._Data 3 .JPG
Lab Manual Preparation and Analysis of a Co-ordination Compound .pdf
__MACOSX/._Lab Manual Preparation and Analysis of a Co-ordination Compound .pdf
Lab Preparation/.DS_Store
__MACOSX/Lab Preparation/._.DS_Store
Lab Preparation/Format of the lab report .docx
Read the experiment from the lab packet you have purchased.
Preparation of a Co-ordination Compound (changes)
NOTE: In order to reduce the cost of this experiment we will reduce the amounts of all reagents by 50%.
For the synthesis use: 5.0g Ammonium chloride in 10 mL water
7.5 g cobalt (II) chloride hexahydrate
0.5 g powdered charcoal
16 ml concentrated ammonia water
20 mL of 30% hydrogen peroxide – add one mL at a time in an ice bath keeping the temperature below 10 degrees. – You must mix the flask after each addition and check the temperature before the next addition. If the temperature is above 10 degrees you must wait until it drops below 10 degrees.
After all the hydrogen peroxide has been added heat to 60 degrees for 30 to 60 minutes (or until 5 o’clock) in a water bath then cover and leave in your draw until the next lab period. (If you still have time you can start the recystallization.)
Second week (done with the molecular models lab)
First recrystallization: use 60 mL water in a 150 mL beaker and 3 mL HCl. Heat to boiling. Remove the charcoal by a hot filtration.
Second recystallization: Add 10 mL concentrated HCl to the filtrate. Cool in ice bath. Collect the crystal in a Buchner funnel by vacuum filtration. Wash the crystals. Dry and weigh.
Format
Abstract
Introduction - define
Coordination compound
Catalyst
Theoretical yield
Actual yield
% yield
Data - include
wt. of CoCl2.6H2O
Volume of H2O2 solution (density =1.13 g/ml)
Wt of ammonium chloride
Volume of concentrated ammonia (15M NH3)
Limits on Results
Calculations- Using the equation
2CoCl2.6H2O + 10 NH4OH + 2NH4Cl + H2O2 -----> 2[Co(NH3)6]Cl3 + 24H20
1) Using the quantities of the initial reactants establish the limiting reagent.
2) Using the limiting reagent calculate the theoretical yield of [Co(NH3)6]Cl3.
3) Using the mass of [Co(NH3)6]Cl3 obtained and the answer to 2, calculate the % yield.
Conclusions
Questions - prelab 1-3 (p 43)
p 40 # 5
