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Use Quantitative Analysis and Chemical Function to Calculate the Mass Percentage of Cuco3 in the Mixture of Cuo and Cuco3

Essay by   •  November 9, 2017  •  Lab Report  •  1,166 Words (5 Pages)  •  1,669 Views

Essay Preview: Use Quantitative Analysis and Chemical Function to Calculate the Mass Percentage of Cuco3 in the Mixture of Cuo and Cuco3

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Chemistry 1A                                                                                                                

Experiment 2

Tittle: quantitative analysis of a mixture (%CuCO3)

Propose: Use quantitative analysis and chemical function to calculate the mass percentage of CuCO3 in the mixture of CuO and CuCO3.

Introduction:

 Quantitative analysis is concerned with the determination of the amounts of one particular substance in a mixture. Quantitative analysis is to produce results that are as precise and accurate as possible. The analysis is performed more than once, usually a minimum of three times. The results of all the experimental trials are combined to give one single answer, usually the average value of all the trials.

 In this experiment, we will identify the percentage of CuCO3 in the mixture of CuO and CuCO3.  Heat the sample to decompose the CuCO3. The loss of mass upon heating will allow you to calculate the amount of CO2 produce, which will allow you to use stoichiometry and calculate the original mass of CuCO3 present.

Equipment: Crucible, Bunsen burner, analytical balance, ring stand, clay triangle, wire gauze, clamp, crucible tongs.

Procedure:

  1. Get the unknown example from teacher, and divide the mixture in three separate samples.
  2. Weigh three clean and dry crucibles separately on the analytical balance, and record mass of empty crucible
  3. Put 3 mixture samples to three crucibles, and weigh the mass of crucibles and mixture, and record data
  4. Mound clay triangle on a ring stand to hold crucibles and heat each of crucibles with a Bunsen burner (top of outer flame) for 5 minutes
  5. After heating, put the crucible on the wire gauze to cool down the crucible to room temperature and weigh the crucible, and record data
  6. Repeat heating and weighing crucible 3 times, and record weight of crucible after each weigh
  7. Calculate the percentage mass of CuCO3 of each sample, and get the average value

Data & calculation:

 Unknown number: 572

  Chemical equation: copper(II) carbonate + heat  copper(II) oxide + carbon dioxide

  Molar mass of CO2: 44.01g/mol

  Molar mass of CuCO3: 123.56g/mol

Sample#

1

2

3

Mass of empty crucible

18.69g      

                     

20.87g

                         

18.79g

                         

Mass of crucible + sample before heating

19.60g    

                     

21.69g      

                           

19.42g      

                         

Mass of crucible + sample

After first heating

19.3403g    

                     

21.4517g    

                           

19.2480g        

                         

Mass of crucible + sample

After second heating

19.3399g      

                       

1.4513g    

                         

19.2478g      

                         

Mass of crucible + sample

At constant mass

19.3392g    

                       

21.4508g  

                         

 9.2472g

                         

Mass of original sample

0.91g

0.82g

0.63g

Mass of CO2 produced

(mass lost upon heating)

0.2608g

0.2392g

0.1728g

Mass of CuCO3 in original

sample

0.7322g

0.6716g

0.4851g

%CuCO3 in original

sample

80.46%

81.90%

77.00%

...

...

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