Consider the Buffer Pair, NH₄Cl/NH₃

question 80

Multiple Choice

Consider the buffer pair, NH₄Cl/NH₃. What can be stated about the relative proportions of this buffer pair if the pH of an aqueous solution of this pair is adjusted to 12.00 and the p K _a for NH₄⁺ equals 9.25?

• A) This buffer solution contains relatively more NH₄⁺ than NH₃.
• B) This buffer solution contains relatively more NH₃ than NH₄⁺.
• C) This buffer solution contains equal concentrations of NH₄⁺ and NH₃.
• D) More information is needed to determine the relative proportion of each member.

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Definitions:

Atoms

The basic units of matter, consisting of a nucleus surrounded by electrons.

Molecules

Molecules are groups of two or more atoms held together by chemical bonds, forming the smallest identifiable unit into which a pure substance can be divided while retaining its composition and chemical properties.

Ions

Atoms or molecules with an electrical charge due to the loss or gain of one or more electrons.

Molecule

A molecule is the smallest unit of a chemical compound that retains its chemical properties, consisting of two or more atoms bonded together.