How many mEq of magnesium sulfate ( molecular weight =120 )...

How many $\mathrm{mEq}$ of magnesium sulfate ( molecular weight $=120$ ) are represented in each $30-\mathrm{mL}$ dose of a $10 \%(\mathrm{w} / \mathrm{v})$ magnesium sulfate extemporaneous laxative preparation?

Key Concepts

Milliequivalent (mEq) Calculation

Milliequivalents measure the reactive capacity of an ion in solution, taking into account its valence or charge. The conversion from moles (or mass) to milliequivalents is essential in clinical settings, particularly for ensuring that the dosing of electrolyte solutions or ionizable compounds accurately reflects their physiological activity.

Weight/Volume Percentage Concentration

This concept defines the concentration of a solution by the weight of solute present in a given volume of solution, typically expressed as grams per 100 milliliters. It is a foundational concept in pharmaceutics, allowing one to calculate how much active ingredient is available in any given volume of a preparation.

Dosage Calculation from Solution Concentration

This concept involves determining the total amount of a substance in a specific dose by multiplying the concentration (derived from the weight/volume percentage) by the volume of the dose. It is crucial to ensure that the correct amount of the active ingredient is administered.

Molecular Weight and Molar Conversions

Molecular weight represents the mass of one mole of a compound and is used as a conversion factor to translate a substance’s mass into moles. This conversion is vital in stoichiometric calculations and allows for the proper quantification of chemical substances in various reactions and dosage formulations.

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