A sample of intracellular fluid contains 45.1 meq / L^2 of Mg^2+ ion. Assume the Mg^2+ comes fro

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A sample of intracellular fluid contains 45.1 meq / L^2 of...

A sample of intracellular fluid contains $45.1 \mathrm{meq} / \mathrm{L}^2$ of $\mathrm{Mg}^{2+}$ ion. Assume the $\mathrm{Mg}^{2+}$ comes from dissolved $\mathrm{MgCl}_2$, and calculate the number of moles and number of grams of $\mathrm{MgCl}_2$ that would be found in $250 . \mathrm{mL}$ of the intracellular fluid.

Key Concepts

Volume Conversion in Concentration Calculations

Volume conversion, such as from milliliters to liters, is a fundamental step in many concentration calculations. Since concentrations are often expressed per liter, converting the given volume to liters ensures that the calculations are dimensionally consistent and accurate.

Molar Mass and Conversion between Moles and Grams

Molar mass is the mass of one mole of a substance, expressed in grams per mole, and is a critical factor in converting the amount of substance from moles to grams. This conversion is essential in quantitative analysis, enabling the calculation of a substance’s mass from its molar amount.

Stoichiometry of Ionic Compounds

This concept involves understanding the fixed ratio in which ions combine to form ionic compounds. When a compound dissociates in solution, each formula unit produces ions in specific proportions. The stoichiometric relationship allows us to convert between the moles of a given ion and the moles of the original compound.

Milliequivalent Concept

A milliequivalent (meq) is one thousandth of an equivalent, which quantifies the reactive capacity of an ion based on its charge. In solution chemistry, converting between milliequivalents and moles requires consideration of the ion’s valence, as the number of equivalents is related to the total charge present.

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