Which of the following is an example of an Arrhenius base?

A. CuSO₄
Incorrect. The Arrhenius definition says that bases must increase the concentration of hydroxide ions in the solution.

B. KOH
Correct!

C. MgCO₃
Incorrect. The Arrhenius definition says that bases must increase the concentration of hydroxide ions in the solution.

D. HCl
Incorrect. The Arrhenius definition says that bases must increase the concentration of hydroxide ions in the solution.

When ammonia is dissolved in water, the solution turns red litmus blue. The following equation shows the dissociation of ammonia in water. Based upon this dissociation, ammonia is identified as —

NH₃ + H₂O → NH₄⁺ + OH^-

A. Bronsted-Lowry base
Correct!

B. Arrhenius base
Incorrect. This is not an Arrhenius base.

C. Arrhenius acid
Incorrect. This is not an Arrhenius acid.

D. Bronsted-Lowry acid
Incorrect. This is not a Bronsted-Lowry acid.

Identify the Bronsted-Lowry base in the reaction below —

H₂SO₄ + H₂O → HSO₄^- + H₃O⁺

A. H₂SO₄
Incorrect. Remember that the Bronsted-Lowry base acts as a proton acceptor.

B. H₂O
Correct!

C. HSO₄^-
Incorrect. Remember that the Bronsted-Lowry base acts a proton acceptor.

D. H₃O⁺
Incorrect. Remember that the Bronsted-Lowry base acts as a proton acceptor.

What substance is missing from the unbalanced neutralization equation below?

H₂SO₄ + Ba(OH)₂ → H₂O + __________

A. BaS
Incorrect. Remember the products of an acid-base reaction are always a salt and water. The salt is composed of ions from both the acid and base. Therefore, the resulting salt of this reaction must contain both Ba⁺² and SO₄^-2.

B. SO₂
Incorrect. Remember the products of an acid-base reaction are always a salt and water. The salt is composed of ions from both the acid and base. Therefore, the resulting salt of this reaction must contain both Ba⁺² and SO₄^-2.

C. BaSO₄
Correct!

D. BaH₂
Incorrect. Remember the products of an acid-base reaction are always a salt and water. The salt is composed of ions from both the acid and base. Therefore, the resulting salt of this reaction must contain both Ba⁺² and SO₄^-2.