Assume that the conductivity of a solution depends only on the total concentration of dissolved ions and that you measure the conductivity of three different solutions while performing titrations in which
I.50.00 mL of 0.100 M aqueous CH 3 CO 2 H is titrated by addition of 0.100 M NaOH.
II.50.00 mL of 0.100 M aqueous NaBr is titrated by addition of 0.100 M AgNO 3 .
III.50.00 mL of 0.100 M aqueous CaCl 2 is titrated by addition of 0.100 M Na 2 CO 3 .
-Which of the above graphs corresponds to titration I?
A)graph (1)
B)graph (2)
C)graph (3)
D)None of the graphs

Question

Assume that the conductivity of a solution depends only on the total concentration of dissolved ions and that you measure the conductivity of three different solutions while performing titrations in which
I.50.00 mL of 0.100 M aqueous CH 3 CO 2 H is titrated by addition of 0.100 M NaOH.
II.50.00 mL of 0.100 M aqueous NaBr is titrated by addition of 0.100 M AgNO 3 .
III.50.00 mL of 0.100 M aqueous CaCl 2 is titrated by addition of 0.100 M Na 2 CO 3 . 
-Which of the above graphs corresponds to titration I?
A)graph (1) 
B)graph (2) 
C)graph (3) 
D)None of the graphs

Quizplus · Accepted Answer

The graph for titration I should show a sudden increase in conductivity at the equivalence point when all the CH3COOH is converted to CH3COO- ions. Graph 2 shows this behavior with a sharp increase in conductivity at a pH of about 8, which is close to the expected equivalence point of the titration. Graphs 1 and 3 do not show this behavior, and none of the graphs show the expected behavior for titrations II and III. Therefore, the answer is B.

Assume That the Conductivity of a Solution Depends Only on the Total