Titrations (Zac)

-a titration is an experimental technique used to determine the concentration of an unknown solution.
Terms & Equipment
-buret - contains the known solution. used to measure how much is added
-stop cock- valve used to control the flow of solution from the buret
-pipet - used to accurately measure the volume of unknown solution
-erlenmeyer flask - container for unknown solution
-indicator - used to identify the endpoint of the titration
-stock solution - known solution
Eg. Zac completed a titration .330 M NaOH with 15.00 mL samples of HI of unknown concentration.  The data he gathered is below.  Determine the concentration of HI.

Trial                                1                     2                     3                      4
Final Reading (mL)        11.9                22.8                34.2                43.1
Initial reading (mL)          .7                  11.9                22.8                34.2 
Volume Used (mL)        11.2               10.9                11.4                 8.9*
*insignificant due to inaccuracy
NaOH + HI = NaI + HOH