Question 1

When 0.500 mol of HC₂H₃O₂is combined with enough water to make a 300 mL solution, the concentration of HC₂H₃O₂is M.

Accepted Answer

The concentration (Molarity) is calculated by dividing the number of moles by the volume in liters. 0.500 mol / 0.300 L = 1.67 M.

Question 2

Ammonia is a strong base.

Accepted Answer

Ammonia is a weak base because it does not fully dissociate in water.

Question 3

A weak electrolyte exists predominantly as _ in solution.

Accepted Answer

A weak electrolyte only partly ionizes in solution, so most of it remains in the form of undissociated molecules.

Question 4

The compound NH₄Cl is a weak acid.

Accepted Answer

The presence of hydrogen in the compound indicates that it is a potential acid. The fact that it is described as "weak" indicates that it only partially dissociates in water, leading to a low concentration of H+ ions in solution.

Question 5

HNO₂is a strong acid.

Accepted Answer

HNO₂ appears to be a nonsensical or incorrectly formatted chemical formula, not representing a known strong acid. Strong acids have well-defined, recognized formulas, such as HCl (hydrochloric acid) or H2SO4 (sulfuric acid).

Question 6

Ca(OH)₂is a strong base.

Accepted Answer

The answer of Ca(OH)₂is a strong base....

Question 7

The compound HClO₄is a weak acid.

Accepted Answer

The compound HClO is a weak acid, but the notation "₄" does not correspond to any recognized chemical notation or compound, making the statement incorrect as presented.

Quiz 4: Aqueous Reactions and Solution Stoichiometry

When 0.500 mol of HC2H3O2 is combined with enough water to make a 300 mL solution, the concentration of HC2H3O2 is M.

Ammonia is a strong base.

A weak electrolyte exists predominantly as _ in solution.

The compound NH4Cl is a weak acid.

HNO2 is a strong acid.

Ca(OH)2 is a strong base.

The compound HClO4 is a weak acid.

When 0.500 mol of HC₂H₃O₂is combined with enough water to make a 300 mL solution, the concentration of HC₂H₃O₂is M.

The compound NH₄Cl is a weak acid.

HNO₂is a strong acid.

Ca(OH)₂is a strong base.

The compound HClO₄is a weak acid.