Bromothymol+blue+pH+lab

Prelab: Review safety contract- you will be working with chemicals- so no eating / drinking, glassware will also be used, wear googles throughout the experiment, take care to follow all instructions and wash hands following the lab.

=As a group perform the following:=
 * 1) Connect your laptop to the usb plug of the vernier apparatus.
 * 2) Open logger pro by using the search option in the upper right hand corner of your laptop. Enter Logger
 * 3) Choose open from the menu, then Experiments, then open the folder, "probes and sensors", choose "pH vs Time"
 * 4) Be sure your sensor is working- have Mrs Murray Check it
 * 5) **Read steps 6 -8 they will need to be performed simultaneously**.
 * 6) Start Collecting data by pressing the green arrow collection button.
 * 7) Blow into the straw.
 * 8) Make and record qualitative and quantitative observations
 * 9) Save the run.
 * 10) **Read steps 10 - 12 they will need to be performed simultaneously**.
 * 11) Start the collection again.
 * 12) Add a drop of 10% NaOH to the solution, swirl, add a drop, swirl, repeat until the solution is the original color.
 * 13) Save the run and print enough copies of the graph for
 * 14) Be ready to verbally summarize your observations and analyzed results / conclusion to Mrs. Murray

Check out the following for Bromothymol Blue / record notes in your notebook http://antoine.frostburg.edu/chem/senese/101/acidbase/indicators.shtml http://uu2m.info/science/profdev/handbook/solutions.html

Also Download and read the following presentation: