|
|
| Objective |
To determine the pH of some unknown liquids. |
| Participants |
Teams of up to six.
|
| Materials |
Each team will be issued with dropping
bottles of solutions adjusted to known pH values of 1, 3, 5, 7, 9,
11, 13. They will also be issued with dropping bottles of indicators:
bromthymol blue, phenolphthalein, alizarin yellow, orange IV, bromcresol
green, bromphenol blue and methyl red. The teams will also be given
two sheets of clear plastic (acetate sheets) on which they can do
spot tests. Plain paper will be provided for an underlay.
|
| Rules |
The event will involve an analytical race. Each team will be given
three unknowns for which they are to determine the pH as precisely
as possible. They must first determine the color change ranges of
the indicators and then use the indicators wisely to zero in on
the closest pH.
The teams will be issued with a sheet of paper with the three unknowns
named. They will fill in their results on this sheet and form a
line at the judging table. If the analysis is incorrect, the judge
will mark which unknowns are correct and which are incorrect and
send the team back to correct their error.
|
| Judging |
The teams will be assigned points based
on their relative time of accomplishing the analysis.
|
| Source |
Technical University of Nova Scotia |
 |
 |
|
|
| |
| | | | |
| | |
|
