Chemistry 51 - Fundamentals of Chemistry » Fall 2021 » Acids and Bases Review Questions

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Question #1
Identify the Brønsted-Lowry acids in the following reaction. H2O + CO32- → HCO3- + OH-
A.   OH-/HCO3-
B.   H2O/HCO3-
C.   CO32-/OH-
D.   H2CO3/H2O
E.   CO32-/HCO3-
Question #2
The conjugate base of HClO3 is
A.   HClO.
B.   HClO2.
C.   Cl(OH)2.
D.   ClO3.
E.   ClO3-.
Question #3
Which of the following is correctly identified?
A.   H2CO3, strong acid
B.   HCl, weak acid
C.   NaOH, strong base
D.   Ca(OH)2, weak base
E.   NH3, strong acid
Question #4
Which of the following is the weakest acid?
A.   HCN ( Ka for HCN is 4.9 × 10-10)
B.   HF ( Ka for HF is 7.2 × 10-4)
C.   HCNO ( Ka for HCNO is 2 × 10-4)
D.   H3BO3 ( Ka for H3BO3 is 5.4 × 10-10)
Question #5
The Ka for hydrofluoric acid is 7.2 × 10-4. This means that HF is
A.   a strong acid.
B.   able to react with HCl.
C.   a weak acid.
D.   neutral in water solution.
E.   ionic.
Question #6
Which of the following statements correctly describes the hydronium-hydroxide balance in the given solution?
A.   In bases, [OH-] = [ H3O+].
B.   In bases, [OH-] is greater than [ H3O+].
C.   In neutral solutions, [ H3O+] = [ H2O].
D.   In acids, [OH-] is greater than [ H3O+].
E.   In bases, [OH-] is less than [ H3O+].
Question #7
What is the [OH-] in a solution that has a [ H3O+] = 2.0 × 10-4 M?
A.   5.0 × 10-10 M
B.   1.0 × 10-10 M
C.   2.0 × 10-10 M
D.   2.0 × 10-4 M
E.   5.0 × 10-11 M
Question #8
The name given to an aqueous solution of HBr is
A.   hydrobromic acid.
B.   bromic acid.
C.   hypobromous acid.
D.   hydrogen bromide.
E.   bromous acid.
Question #9
What is the pH of a solution with [ H3O+] = 1 × 10-9 M?
A.   -5.0
B.   5.0
C.     
D.   1.0 × 10-5 M
E.   -9.0
F.   9.0
Question #10
The [ H3O+] of a solution with pH = 2 is
A.   1 × 10-2 M.
B.   10 M.
C.   1 × 102 M.
D.   1 × 10-12 M.
E.   -10 M.
Question #11
Which of the following is the correctly balanced equation for the complete neutralization of H3PO4 with Ca(OH)2?
A.   H3PO4 + Ca(OH)2 → Ca3(PO4)2+ H2O
B.   3H3PO4 + Ca(OH)2 → Ca3(PO4)2 + 5H2O
C.   H3PO4 + Ca(OH)2 → CaHPO4 + 2H2O
D.   4H3PO4 + 6Ca(OH)2 → 2Ca3(PO4)2 + 12H2O
E.   2H3PO4 + 3Ca(OH)2 → Ca3(PO4)2 + 6H2O
Question #12
In a neutralization reaction, how many moles of HClO4 react with 1 mole of Al(OH)3?
A.   2
B.   1
C.   3
D.   5
E.   4
F.     
Question #13
A 25.0 mL sample of H2SO4 requires 20.0 mL of 2.00 M KOH for complete neutralization. What is the molarity of the acid? H2SO4 + 2KOH → K2SO4 + 2H2O
A.   2.50 M
B.   1.25 M
C.   2.00 M
D.   0.800 M
E.   1.60 M
F.     
Question #14
How many milliliters of 0.200 M NaOH are required to completely neutralize 5.00 mL of 0.100 M H3PO4?
A.   0.833 mL
B.   2.50 mL
C.   15.0 mL
D.   5.00 mL
E.   7.50 mL
Question #15
For the problem(s) that follow, consider the reaction in which magnesium reacts with an HCl solution. Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g) If 2.00 g of Mg reacts completely with 50.0 mL of HCl solution, what is the molarity of the HCl solution?
A.   3.29 M
B.   8.00 M
C.   1.65 M
D.   80.0 M
E.   0.823 M
Question #16
The function of a buffer is to
A.   maintain the pH of a solution.
B.   change color at the end point of a titration
C.   maintain a neutral pH.
D.   be a strong base.
E.   act as a strong acid.
Question #17
Which one of the following is characteristic of a base?
A.   has a sour taste
B.   has a slippery, soapy feel
C.   produces H3O+ in water
D.   turns blue litmus red
E.   is insoluble in water
Question #18
In a buffer system of HF and its salt, NaF,
A.   the HF neutralizes added base.
B.   the HF neutralizes added acid.
C.   the F- neutralizes added base.
D.   the HF is not necessary.
E.   the F- neutralizes added H2O.
Question #19
Which of the following is a buffer system?
A.   NaCl and NaNO3
B.   HCl and NaOH
C.   NaCl and NaOH
D.   H2O and HCl
E.   H2CO3 and KHCO3
Question #20
Which solution has the highest pH?
A.   a buffer made with 0.01 M acetic acid and 0.01 M sodium acetate
B.   a buffer made with 0.10 M acetic acid and 0.10 M sodium acetate
C.   All of the buffers have the same pH since they are all made with acetic acid and sodium acetate.
D.   a buffer made with 0.10 M acetic acid and 0.01 M sodium acetate
E.   a buffer made with 0.01 M acetic acid and 0.10 M sodium acetate
Question #21
The name of Al(OH)3 is
A.   aluminum hydroxide.
B.   aluminum trihydroxide.
C.   monoaluminum trihydroxide.
D.   aluminum(III) hydroxide.
E.   aluminum oxygen hydride.

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