Unit 09 Review

Based on this information, it can be concluded that in the forward reaction...

• Methylamine and water both act as bases.

• Methylamine and water both act as acids.

• Methylamine acts as a base and water acts as an acid.

• Methylamine acts as an acid and water acts as a base.

Which compound is the conjugate base to the parent acid (H₂O) of this reaction?

• CH₃NH₂

• H₂O

• CH₃NH₃⁺

• OH^-

Which of the following is true according to the Arrhenius theory of acids and bases?

• A strong acid increases the OH- ion concentration of an aqueous solution.

• A strong acid increases the H+ ion concentration of an aqueous solution.

• A strong acid decreases the H+ ion concentration of an aqueous solution.

• A strong acid decreases the OH- ion concentration of an aqueous solution.

An unknown solution tastes bitter and feels slippery. When a pure zinc strip is placed in the solution, no reaction is observed. Which substance below is most likely to be the identity of the solution?

• HCl (aq)

• H₂SO₄ (aq)

• NaOH (aq)

• NaCl (aq)

Hydrobromic acid, HBr, is a strong acid. Hydrofluoric acid, HF, is a weak acid. If you prepared equal concentrations of both acids in separate containers which would be TRUE?

• The hydrobromic acid would only partially dissociate.

• Both solutions would have the same pH.

• The pH of hydrobromic acid would be less than the pH of hydrofluoric acid.

• The pH of hydrofluoric acid would be less than the pH of hydrobromic acid.

A 1L sample of solution of sulfuric acid (H₂SO₄), a strong acid, has a concentration of 2.7 x 10^-3 M. Use this

information to answer the next two questions.

What is the concentration of hydrogen ions, [H+], that sulfuric acid releasing into the solution, assuming complete dissociation? (HINT: 2.7 x 10^-3 is for ONE H. How many H does H₂SO₄ have?)

• 5.4 x 10^-3 M

• 2.7 x 10^-3 M

• 1.3 x 10^-8 M

• 2.7 x 10^-1 M

In a reaction between nitric acid, known to be a strong acid, and Sr(OH)₂, a strong base, which salt would be formed as a product of the neutralization reaction?

• Sr(NO₂)₂

• Sr(NO₃)₂

• Sr₃N₂

• H₂O

Which stoichiometry set up most correctly determines the number of moles of hydrogen ions present in an unknown concentration of HCl (aq) strong acid analyte solution when it is titrated with 21.5 mL of 1.0M Ba(OH)2, a strong base titrant, when the titration reaches its equivalence point?

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In which scenario given could a weak acid have a lower pH than a strong acid?

• A significantly diluted weak acid is compared to a highly concentrated strong acid.

• A significantly diluted strong acid is compared to a highly concentrated weak acid.

• A significantly diluted weak acid is compared to a significantly diluted strong acid.

• A highly concentrated weak acid is compared to a highly concentrated strong acid.

What is the factor of change in hydrogen ion concentration between a pH of 3 and a pH of 6?

• A pH of 3 has a hydrogen ion concentration that is 3 times greater than a pH of 6

• A pH of 3 has a hydrogen ion concentration that is 30 times smaller than a pH of 6

• A pH of 3 has a hydrogen ion concentration that is 30 times greater than a pH of 6

• A pH of 3 has a hydrogen ion concentration that is 1000 times greater than a pH of 6