Which compound is commonly used as a smelling salt and acts as a respiratory stimulant?

Which compound is commonly used as a smelling salt and acts as a respiratory stimulant?

• A. Soda lime
• B. Carbon dioxide
• C. Ammonium carbonate
• D. Aromatic ammonia spirit

Answer: (D)

Smelling salts rely on a sharp, irritating vapour that hits the nasal and airway mucosa to trigger a reflex drive to breathe more deeply. The compound that best fits this purpose is aromatic ammonia spirit, because it releases ammonia gas when exposed to air. That strong, pungent smell irritates the mucous membranes, prompting a quick inhalation and a temporary boost in alertness and respiration—exactly the effect sought in a respiratory stimulant. Soda lime isn’t used for stimulation; it’s an absorbent used to remove CO2 in anesthesia circuits. Carbon dioxide, at least in typical smelling-salt use, isn’t the irritant that induces a rapid breathing response. Ammonium carbonate can release ammonia too, but the standard, widely recognized smelling salt is aromatic ammonia spirit, designed specifically to provide that brisk ammonia vapour.

Smelling salts rely on a sharp, irritating vapour that hits the nasal and airway mucosa to trigger a reflex drive to breathe more deeply. The compound that best fits this purpose is aromatic ammonia spirit, because it releases ammonia gas when exposed to air. That strong, pungent smell irritates the mucous membranes, prompting a quick inhalation and a temporary boost in alertness and respiration—exactly the effect sought in a respiratory stimulant.

Soda lime isn’t used for stimulation; it’s an absorbent used to remove CO2 in anesthesia circuits. Carbon dioxide, at least in typical smelling-salt use, isn’t the irritant that induces a rapid breathing response. Ammonium carbonate can release ammonia too, but the standard, widely recognized smelling salt is aromatic ammonia spirit, designed specifically to provide that brisk ammonia vapour.