mEq denotes which measurement?

mEq denotes which measurement?

• A. milligram
• B. microliter
• C. milliequivalent
• D. molarity

Answer: (C)

This measures the amount of a substance in terms of chemical charge, called milliequivalents. It’s used because dosing often depends on how many electrical charges the ions can carry, not just their weight. The key idea is that the same amount of substance with different charges contributes different reactive capacity: one millimole of a monovalent ion (charge is ±1) equals 1 milliequivalent, while one millimole of a divalent ion (charge ±2) equals 2 milliequivalents. For example, 1 mmol of potassium ion (K+) gives 1 mEq, but 1 mmol of calcium ion (Ca2+) gives 2 mEq. This is different from milligrams (mass) and from molarity (moles per liter); mEq specifically ties amount to the ion’s charge, reflecting its functional impact in chemical and physiological processes.

This measures the amount of a substance in terms of chemical charge, called milliequivalents. It’s used because dosing often depends on how many electrical charges the ions can carry, not just their weight. The key idea is that the same amount of substance with different charges contributes different reactive capacity: one millimole of a monovalent ion (charge is ±1) equals 1 milliequivalent, while one millimole of a divalent ion (charge ±2) equals 2 milliequivalents. For example, 1 mmol of potassium ion (K+) gives 1 mEq, but 1 mmol of calcium ion (Ca2+) gives 2 mEq. This is different from milligrams (mass) and from molarity (moles per liter); mEq specifically ties amount to the ion’s charge, reflecting its functional impact in chemical and physiological processes.