An Analyst Needs to Prepare a Standard of Fentanyl for a Toxicological

question 14

Multiple Choice

An analyst needs to prepare a standard of fentanyl for a toxicological analysis. The standard is supplied as a powder of fentanyl citrate. The formula weight of the citrate salt is 528.6 g/mol and the formula weight of fentanyl alone is 336.5 g/mole. The analyst is preparing 100.0 mL of the standard at a concentration of 250 ppm (mg/L) . How much powder will they have to weigh out to make this standard?

• A) 25.0
• B) 12.5
• C) 50.0
• D) 39.3
• E) none of the above

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Definitions:

Resting Potential

The electrical charge across the neuronal membrane when the neuron is not actively transmitting a signal, representing a stable state of readiness for activation.

Positively Charged

Having a greater number of protons than electrons, resulting in an electric charge that is positive.

Sympathetic Components

Parts of the sympathetic nervous system, a branch of the autonomic nervous system responsible for the body's 'fight or flight' response.

Parasympathetic Components

Components of the parasympathetic nervous system, which helps to conserve energy and restore the body to a state of calm after periods of stress or danger.