CHM142 Exam 3 Review 2024/2025 with
Correct Answers | 2025 LATEST
UPDATED.
0.0131
In a 0.731M solution, a weak acid is 12.5% dissociated. Calculate Ka
0.02418, 0.024, 4.1x10^-13
HF has a Ka of 6.8 x 10^-4. What are [H2O+], [F-] and [OH-]?
11.97
What is the pH of 0.11M diethylamine where its Kb is 8.6x10^-4?
9.1 x 10^-7
determine the Kb of a weak base of 0.23M solution if the base has a pH of 10.66 at 25 C
1.59 x 10^-10
what is the Kb of the benzoate ion?
3.1 x 10^-10
what is the Kb of the 2-hydroxylammonium ion (pKb = 4.49)
,5.76
what is the pH of 0.135M methylammonium bromide, Kb = 4.4x10^-4
8.38
what is the pH of 0.40M NaF
acidic
is Cr(NO3)3 acidic, basic or neutral?
basic
is NaHS acidic, basic or neutral?
acidic
is Zn(CH3COO)2 acidic, basic or neutral?
Co is the base, Ni is the acid
what are the lewis acid and lewis base in the equation 4CO + Ni --> Ni(CO)4
KCN/HCN, Na2SO4/NaHSO4
What solution can act as a buffer solution?
KCN/HCN
Na2SO4/NaHSO4
, NH3/NH4NO3
NaI/HI
10.4
Find the pH of a buffer than consists of 0.34M CH3NH2 and 0.58M CH3NH3Cl (pKb of CH3NH2 = 3.35)
Ka2, 7.5
A buffer consists of 0.16M NaH2PO4 and 0.32M Na2HPO4. Phosphoric acid is a triprotic acid (Ka1 = 7.2 x
10^-3, Ka2 = 6.3 x 10^-8, Ka3 = 4.2 x 1-^-13). Which buffer is most important? What is the buffer pH?
4.3
what is the correct concentration ratio of [CH3COO-]/[CH3COOH] of a buffer solution that has a pH of
5.37 (Ka = 1.8 x 10^-5)
9.18
A buffer that contains a 0.491M base, B, and 0.297M of its conjugate acid, BH+, has a pH of 9.14. What is
the pH after 0.00200mol HCl is added to 0.250L of solution
10.20
A buffer is prepared by mixing 50.0mL of 0.050M sodium bicarbonate and 10.7ml of 0.10M NaOH (Ka =
4.7 x 10^-11)
12.79, 10.90, 1.928
Correct Answers | 2025 LATEST
UPDATED.
0.0131
In a 0.731M solution, a weak acid is 12.5% dissociated. Calculate Ka
0.02418, 0.024, 4.1x10^-13
HF has a Ka of 6.8 x 10^-4. What are [H2O+], [F-] and [OH-]?
11.97
What is the pH of 0.11M diethylamine where its Kb is 8.6x10^-4?
9.1 x 10^-7
determine the Kb of a weak base of 0.23M solution if the base has a pH of 10.66 at 25 C
1.59 x 10^-10
what is the Kb of the benzoate ion?
3.1 x 10^-10
what is the Kb of the 2-hydroxylammonium ion (pKb = 4.49)
,5.76
what is the pH of 0.135M methylammonium bromide, Kb = 4.4x10^-4
8.38
what is the pH of 0.40M NaF
acidic
is Cr(NO3)3 acidic, basic or neutral?
basic
is NaHS acidic, basic or neutral?
acidic
is Zn(CH3COO)2 acidic, basic or neutral?
Co is the base, Ni is the acid
what are the lewis acid and lewis base in the equation 4CO + Ni --> Ni(CO)4
KCN/HCN, Na2SO4/NaHSO4
What solution can act as a buffer solution?
KCN/HCN
Na2SO4/NaHSO4
, NH3/NH4NO3
NaI/HI
10.4
Find the pH of a buffer than consists of 0.34M CH3NH2 and 0.58M CH3NH3Cl (pKb of CH3NH2 = 3.35)
Ka2, 7.5
A buffer consists of 0.16M NaH2PO4 and 0.32M Na2HPO4. Phosphoric acid is a triprotic acid (Ka1 = 7.2 x
10^-3, Ka2 = 6.3 x 10^-8, Ka3 = 4.2 x 1-^-13). Which buffer is most important? What is the buffer pH?
4.3
what is the correct concentration ratio of [CH3COO-]/[CH3COOH] of a buffer solution that has a pH of
5.37 (Ka = 1.8 x 10^-5)
9.18
A buffer that contains a 0.491M base, B, and 0.297M of its conjugate acid, BH+, has a pH of 9.14. What is
the pH after 0.00200mol HCl is added to 0.250L of solution
10.20
A buffer is prepared by mixing 50.0mL of 0.050M sodium bicarbonate and 10.7ml of 0.10M NaOH (Ka =
4.7 x 10^-11)
12.79, 10.90, 1.928
