Chemistry

Showing Calculations in Lab Reports

 

When doing calculations for a lab report, each calculation should include the following:

 

Below is a sample of what the lab calculations section of your lab report should look like.

 

Calculations

 

            1. Mass of NaHCO3  =  (Mass of dish w/ NaHCO3 ) – (Mass of dish)

                                              =  43.72 g – 41.01g

                                              =  2.71 g

 

                                                     mass              2.71 g

            2. Moles of NaHCO3  =  -------  =  ------------------   =  0.0323 moles

                                                     MW        84.0059 g/mol

 

 

            3. Mass of NaCl  =  (Mass of dish w/ NaCl) – (Mass of dish)

                                        =  42.86 g – 41.01 g

                                        =  1.85 g

 

                                                 m              1.85 g

            4. Moles of NaCl  =  -------  =  -----------------   =  0.0317 moles

                                               MW        58.443 g/mol

 

 

                                 moles of NaCl                0.031655 moles

            5. Ratio  =  ---------------------  =  ---------------------  =  0.981

                               moles of NaHCO3            0.032260 moles

 

 

                                         | Accepted value – Exp. Value |                              | 1 - .98125 |

            8. Percent error = -------------------------------------- x 100   =   ----------------- x 100  =  1.88 %

                                                     Accepted Value                                                  1

 

 

Notice that: