A prescription order calls for a 500 mL solution of NaCl containing 10 mEq of Na^+. How many mi

step 1 To calculate the milliliters of 1 .5 .000 molar of a solution of sodium chloride, we need to obt

A prescription order calls for a 500 mL solution of NaCl...

Key Concepts

Milliequivalents

Milliequivalents (mEq) measure the amount of a substance based on its chemical reactivity or charge rather than its mass. It is a way to express concentration that takes into account the ion's valence; for a monovalent ion, one mEq corresponds directly to one-thousandth of a mole. This concept is crucial when preparing solutions where the specified amount of active ion, rather than the whole compound, is important.

Molecular Weight

The molecular weight of a compound is the sum of the atomic weights of all the atoms in a molecule. It serves as a conversion factor that allows one to translate between the number of moles of a substance and its corresponding mass in grams or milligrams. Understanding molecular weight is essential when converting between moles or equivalents and mass of a compound.

Ionic Dissociation

Ionic dissociation refers to the process by which an ionic compound, when dissolved in a solvent, separates into its constituent ions. This is important in solution chemistry because the therapeutic or reactive component in a solution might be one of the ions, not the whole salt. Recognizing the relationship between the salt and its dissociated ions is key when calculating how much of the compound is needed to provide a specified amount of an ion.

Unit Conversion

Unit conversion is the process of converting one unit of measurement to another, such as from moles to milligrams or from equivalents to moles. Accurate conversions are fundamental in pharmaceutical calculations, ensuring that the final preparation meets the precise dosage requirements specified in a prescription.

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