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March 28, 2003
Materials Needed
- 50 mL of 2-propanol
- 50 mL of water
- 1g of tert-butyl chloride
- 0.04 N standarized NaOH
- 10 mL acetone (X6)
- Blue indicator (bromomothymol)
- 250 mL flask with a rubber stopper
- 125 mL flask
- 10 mL pipet with pipet bulb
- Buret
Procedure
- Prepared a 1:1 solution of (50 mL) of 2-propanol and (50 mL) of water
- Mixed well
- Allowed to equilibriate to lab temperature
- Took 150 mL of 0.04 N NaOH in 250 mL flask with rubber stopper
- Poured a little bit of NaOH in buret to rinse (disposed of it afterwards)
- Poured NaOH into buret
- Took 1g of tert-butylchloride and added it with the water-2-propanol solution
- Mixed well and recorded time
- Waited ten minutes for the first sample
- For the first sample, took 10 mL of acetone and placed in the 125 mL flask
- Using the pipet added 10 mL of the tert-butylchloride/water-2-propanol solution into the 125 mL flask
- 3 drops of the bromothyol solution (blue indicator) was added to the flask as well
- Placed the flask underneath the buret with the NaOH and began titration
- Data can be found on Table 1 of displaying the milliliters it took to turn solution blue
- Afterwards, rinsed 125 mL flask with acetone
- Repeated this six more times at 20, 35, 50, 60 (our infinity), 75 and 100 minutes
Observations
- The longer the tert-butylchloride/water-2-propanol sat on room temperature, the longer it took (in mL) for solution to turn blue
- When drops of blue indicator were mixed, solution turned yellow
Tables and Figures
- k = - slope X 2.303
- k = -(20-5)/(100-10) X 2.303
- k = -15/207.27
- k = 0.3838
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