Which of the Following Solutions Will Be the Best Buffer

question 164

Multiple Choice

Which of the following solutions will be the best buffer at a pH of 9.26? (K_a for HC₂H₃O₂ is 1.8 × 10^-5; K_b for NH₃ is 1.8 × 10^-5.)

• A) 0.20M NH₃ and 0.20M NH₄Cl
• B) 5.0M HC₂H₃O₂ and 5.0M NH₄Cl
• C) 0.20M HC₂H₃O₂ and 0.20M NaC₂H₃O₂
• D) 5.0M NH₃ and 5.0M NH₄Cl
• E) 5.0M HC₂H₃O₂ and 5.0M NH₃

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Definitions:

Referred Pain

A phenomenon in which pain felt in a part of the body other than its actual source, due to the network of interconnecting sensory nerves.

Inner Ear

The innermost part of the ear, containing the cochlea and vestibular system, responsible for hearing and balance.

Hair Cells

Sensory receptor cells found in the inner ear, responsible for converting sound vibrations into electrical signals for the brain to interpret.

Mechanoreceptors

Sensory nerve endings that respond to mechanical stimuli such as touch, pressure, vibration, and stretch.