Questions:
a. On the graph, draw dotted lines to show what the pH is at the equilivance point (all trials) and the half-way point (only for weak acid).
b. Using your graph information, determine the Ka of the weak acid.
c. Using your lab information, calculate the theoretical pH at the equilivance point.
d. For Trial 1 & 2, at what pH did the pH indicator change color (called endpoint of indicator) for each trial? Was this during the pH peak? Which pH indicator would you use for this titration, explain?
e. For Trial 3, what was the endpoint of the pH indicator? Was this during the pH peak? For this trial, could you switch the pH indicator and not affect the experiment, explain? From your knowledge of pH indicators and the chemicals in this trial, would you have expected this,explain?
Part II: Titrating Weak Base with Strong Acid
1. Write up steps to perform this task under Procedure section
2. Calculate Molarity of Weak Base
3. Put the graph in the lab notebook and include a title & chemcials
Questions:
a. On the graph, draw dotted lines to show what the pH is at the equilivance point and the half-way point.
b. Using your graph information, determine the Ka of the weak acid.
c. Using your lab information, calculate the theoretical pH at the equilivance point.
d. Could you use either pH indicator from Part I for this titration.
e. In pencil (so if you make a mistake, you can fix it), draw the titration curve if the base was a strong base not weak base (all other parameters in lab are the same).