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

How many $\mathrm{mEq}$ of magnesium sulfate (molecular weight $=120$ ) are represented in each $90-\mathrm{mL}$ dose of a $15 \%(\mathrm{w} / \mathrm{v})$ magnesium sulfate extemporaneous laxative preparation?

Key Concepts

Equivalents and Milliequivalents Calculation

Milliequivalents (mEq) are used to express the reactive capacity of ions in a solution relative to their charge. The calculation usually involves determining the number of moles of the substance, factoring in its valence (or the number of charges), and then converting that to milliequivalents. This concept is particularly important in medical and pharmaceutical contexts when precise dosing of electrolytes and other charged species is required.

Unit Conversion

Unit conversion is the process of converting between different units, such as grams to milligrams or milliliters to liters. This is crucial in calculations to ensure consistency in units, especially when dealing with different scales like mass and volume in solution chemistry.

Molecular Weight and Moles

The molecular weight (or molar mass) tells you how many grams one mole of a substance weighs. Converting a given mass of a compound to moles using its molecular weight is a foundational step in many chemical calculations, including those involving reaction stoichiometry or concentration determinations.

Weight/Volume Percent Concentration

This concept involves expressing the concentration of a solution in terms of grams of solute per 100 milliliters of solution. Understanding weight/volume percent is essential when determining how much of a substance is present in a given volume of solution and is widely used for preparing or analyzing solutions in many fields.

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