Acid-Base Photography Lab Assessment Sheet

 

  1. Starting pH of Dektol:_______
    Classification: (from procedure step 5) _______________________
    Ending pH of Dektol:_______
    Starting pH of Stop Bath:_______
    Classification (from procedure step 35) _______________________
    Ending pH of Stop Bath:_______
  2. Why did the entire sheet of photo paper turn black when it was placed in the Dektol?





  3. How many pieces of paper were you able to develop before the Stop Bath turned lavender?________
    Amount of Dektol used by the Stop Bath?________
  4. Record data from the other groups in your class.  If your class does not have 15 groups,  leave some blank.

    Data Sheet

    Group Number Number of Photos Developed Amount of Dektol Used
    1    
    2    
    3    
    4    
    5    
    6    
    7    
    8    
    9    
    10    
    11    
    12    
    13    
    14    
    15    

  5. What could explain the fact that results differ from group to group?






  6. Do you see greater variance (a wider range of results) between the number of photos developed or the amount of Dektol used?





  7. Explain why the Stop Bath changed colors.