Chem 104 3 UW Madison
2024 exam with 100%
correct answers
At what point in the titration of a weak acid
(analyte) with a strong base (titrant) is the pH
calculated using the concentration of the weak
acid's conjugate base and the Kb? - answer the
equivalence point
On a titration graph, where does pH = pKa? If pKa
is 10^-9, what is pKb? - answer at the 1/2
equivalence point
10^-5
Which type of titration will the pH be basic at the
equivalence point? - answer A weak acid titrated
with a strong base
Which type of titration will the pH be acidic at the
equivalence point? - answer A weak base titrated
with a strong acid
,A 25.0 mL aliquot of 0.100 M NH3 is titrated with
0.150 M HCl. After 10.0 mL of HCl has been added,
which of the following statements is correct?
A. The solution is basic and more titrant must be
added to reach the equivalence point.
B. The solution is basic and excess titrant has been
added beyond the equivalence volume.
C. The solution is acidic and more titrant must be
added to reach the equivalence point.
D. The solution is acidic and excess titrant has
been added beyond the equivalence volume.
E. The solution is neutral and the titration is at the
equivalence point. - answer The solution is basic
and more titrant must be added to reach the
equivalence point.
T/F; A 25.0 mL aliquot of 0.100 M NH3 is titrated
with 0.150 M HCl. After 10.0 mL of HCl has been
added. The solution is basic and excess titrant has
been added beyond the equivalence volume. -
answer false
Methyl red is an acid-base indicator with Ka = 6.3
× 10−6. The unionized form, HIn, is red, and the
anionic form, In−, is yellow. What is the color of a
solution of methyl red at pH = 7.8? - answer yellow
, When solving for the solubility of Mg(OH)2, what
algebraic equation would need to be solved?
(Ksp = Ksp for Mg(OH)2)
A. x2 = Ksp
B. 2x^2 = Ksp
C. x^3 = Ksp
D. 2x^3 = Ksp
E. 4x^3 = Ksp - answer 4x^3 = Ksp
If Q < Ksp, will precipitate form? - answer no
If Q > Ksp, will precipitate form? - answer yes
If Q = Ksp, will precipitate form? - answer no
Which of the following would decrease the Ksp for
PbI2?
A. Lowering the pH of the solution.
B. Adding a solution of Pb(NO3)2.
C. Adding a solution of KI.
D. All of the above.
E. None of the above - answer none of the above
2024 exam with 100%
correct answers
At what point in the titration of a weak acid
(analyte) with a strong base (titrant) is the pH
calculated using the concentration of the weak
acid's conjugate base and the Kb? - answer the
equivalence point
On a titration graph, where does pH = pKa? If pKa
is 10^-9, what is pKb? - answer at the 1/2
equivalence point
10^-5
Which type of titration will the pH be basic at the
equivalence point? - answer A weak acid titrated
with a strong base
Which type of titration will the pH be acidic at the
equivalence point? - answer A weak base titrated
with a strong acid
,A 25.0 mL aliquot of 0.100 M NH3 is titrated with
0.150 M HCl. After 10.0 mL of HCl has been added,
which of the following statements is correct?
A. The solution is basic and more titrant must be
added to reach the equivalence point.
B. The solution is basic and excess titrant has been
added beyond the equivalence volume.
C. The solution is acidic and more titrant must be
added to reach the equivalence point.
D. The solution is acidic and excess titrant has
been added beyond the equivalence volume.
E. The solution is neutral and the titration is at the
equivalence point. - answer The solution is basic
and more titrant must be added to reach the
equivalence point.
T/F; A 25.0 mL aliquot of 0.100 M NH3 is titrated
with 0.150 M HCl. After 10.0 mL of HCl has been
added. The solution is basic and excess titrant has
been added beyond the equivalence volume. -
answer false
Methyl red is an acid-base indicator with Ka = 6.3
× 10−6. The unionized form, HIn, is red, and the
anionic form, In−, is yellow. What is the color of a
solution of methyl red at pH = 7.8? - answer yellow
, When solving for the solubility of Mg(OH)2, what
algebraic equation would need to be solved?
(Ksp = Ksp for Mg(OH)2)
A. x2 = Ksp
B. 2x^2 = Ksp
C. x^3 = Ksp
D. 2x^3 = Ksp
E. 4x^3 = Ksp - answer 4x^3 = Ksp
If Q < Ksp, will precipitate form? - answer no
If Q > Ksp, will precipitate form? - answer yes
If Q = Ksp, will precipitate form? - answer no
Which of the following would decrease the Ksp for
PbI2?
A. Lowering the pH of the solution.
B. Adding a solution of Pb(NO3)2.
C. Adding a solution of KI.
D. All of the above.
E. None of the above - answer none of the above
