write lab report

This  document  highlights  some  frequently  missed  points  in  the  formal  lab  report  for  Unit  5.  This  note  is   not  intended  to  be  a  replacement  for  the  formal  lab  report  guidelines/instructions  that  are  posted  on   Blackboard.  Students  still  need  to  follow  the  detailed  instructions  on  Blackboard.  

Table  of  reactants  and  products  

The  physical  description  of  crude  and  purified  sample  should  be  mentioned  in  the  table  footnote  (i.e.,  at   the  end  of  the  table  using  reference  marks  (asterisks)).  

Discussion:  

Characterization  of  crude  product  was  based  on    

1) Appearance:                  Description  of  the  actual  physical  appearance  of  your  crude  product                  Literature  description  of  product  molecule  (could  be  found  in  text  books  or  websites)                  Conclusive  comparison  between  these  two  melting  points    

2) Melting  point:                  Melting  point  of  your  crude  product  (actual  numerical  values  should  be  mentioned)                  Literature  m.  p.  of  product  molecule  (actual  numerical  values  should  be  mentioned)                Comparison  between  these  two  melting  points                  

Characterization  of  purified  product  was  based  on    

1) Appearance:                  Description  of  the  actual  physical  appearance  of  your  purified  product                  Literature  description  of  product  molecule  (could  be  found  in  text  books  or  websites)                  Comparison  between  these  two    

2) Melting  point:                  Melting  point  of  your  purified  product  (actual  numerical  values  should  be  mentioned)                  Literature  m.  p.  of  product  molecule  (actual  numerical  values  should  be  mentioned)                  Comparison  between  these  two     In  addition  to  the  comparisons  made  to  the  literature  values,  comparisons  between  the  crude   and   purified   samples   should   be   made.   In   this   way,   comments   on   the   effectiveness   of   the   purification  process  can  be  made.  

Yield  discussion:  

Few  reasons  for  any  yield  more  than  100%  should  be  described  (e.  g.  residue  solvent,  impurities  …)  

Few   reasons   for   any   yield   less   than   100%   should   be   described   (potential   impurities   in   reagents,   incomplete  reaction,  side  reactions,  dissolution  of  product  during  filteration,  mechanical  lose….)