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Question 1 of 3

What is the concentration of Chloride ions expressed as equivalence of a solution containing 7.1 grams of Chloride in 200 ml of solution?

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Eq / litre
The concentration of Chloride is 1 Equivalence.
  1. Find the gram equivalent of Chloride.
    Chloride has a valency of 1 and an ionic weight of 35.5. Thus:
    The gram equivalent of Chloride is 35.5 grams.
  2. Find the number of equivalents in 200 ml of solution.
    Number of Equivalents =     Total Mass of Chloride     = 7.1 = 0.2 Equivalents
    Chloride Gram Equivalent      35.5
  3. Find the number of equivalents in 1 litre of solution.
    200 ml of solution contains 0.2 Equivalents. Thus:
    1000 ml of solution contains 1000/200 x 0.2 Eq = 2 Equivalents
    The concentration of Chloride is 2 Eq / litre or an Equivalence of 2.

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Question 2 of 3

Intracellular fluid contains 273.7 milligrams of Potassium ions in 50 ml of fluid. What is the milliequivalence of Potassium ions?

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mEq / litre
The concentration of Potassium is 140 milliEquivalence.
  1. Find the weight of one milliequivalent of Potassium.
    Potassium has a valency of 1 and an ionic weight of 39.1. Thus:
    The gram equivalent of Potassium is 39.1 grams. Thus:
    One milliequivalent of Potassium weighs 39.1 milligrams.
  2. Find the number of milliequivalents in 50 ml of fluid.
    Number of MilliEquivalents =      Total Mass of Potassium    = 273.7 mEq
    Weight of One Milliequivalent      39.1
  3. Find the number of milliequivalents in 1 litre of solution.
    50 ml of fluid contains 7 milliEquivalents. Thus:
    1000 ml of fluid contains 1000/50 x 7 mEq = 140 milliEquivalents
    The concentration of Potassium is 140 mEq / litre or a milliEquivalence of 140.

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Question 3 of 3

250 ml of extracellular fluid contains 25 milligrams of Calcium ions. What is the milliequivalence of Calcium ions? Answer to 1 decimal place.

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mEq / litre
The milliequivalence of Calcium is 5.0.
  1. Find the weight of one milliequivalent of Calcium.
    Calcium has a valency of 2 and an ionic weight of 40.1. Thus:
    The gram equivalent of Calcium is 40.1/2 g = 20.05 grams. Thus:
    One milliequivalent of Calcium weighs 20.05 milligrams.
  2. Find the number of milliequivalents in 250 ml of fluid.
    Number of MilliEquivalents =         Total Mass of Calcium        =     25    mEq
    Weight of One Milliequivalent       20.05
    Number of MilliEquivalents = 1.247 mEq
  3. Find the number of milliequivalents in 1 litre of solution.
    250 ml of fluid contains 1.247 milliEquivalents. Thus:
    1000 ml of fluid contains 1000/250 x 1.247 mEq = 4.98 mEq = 5.0 mEq to 1 dec pl
    The concentration of Potassium is 5.0 mEq / litre or a milliEquivalence of 5.0.

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