Edited Invalid date
18.1 The Danger of Antifreeze -- Part 3
We can use a pH meter or indicator to monitor the titration's pH.
As shown in Figure 18.10>, the data from the direct monitoring of pH with a meter allows the determination of the equivalence point from the pH curve itself.
When the amount of acid equals the amount of base, the endpoint of the titration is indicated by the color change.
A weak organic acid that is a different color than its conjugate base is an indicator.
A pH meter is used.
The volume of base added compound is odorless.
The conjugate base is pink.
A small amount of indicator is required because its color is intense, but it won't affect the neutralization reaction or the solution's pH.
The equilibrium lies far to the left and the solution of color 1 is due to the high H3O+.
The equilibrium is shifted to the right as the titration proceeds.
There is a large change in H3O near the equivalence point since the pH change is large.
There will be a change in color if the correct indicator is chosen.
One drop of the base near the endpoint can change the indicator from color 1 to color 2.
The relative concentra tions of HIn and In- affect the color of a solution.
The indicator solution will be intermediate in color.
The indicator solution will be the color of In-.
The indicator solution will be the color of HIn.
The table shows indicators and their colors as a function of the pH.
An indicator changes color within a range of two pH units.
Review flashcards and saved quizzes
Getting your flashcards
Privacy & Terms