(type 2) Calculate mEq per volume from mg or percent
5. mEq and mOsmol 5.1) mEq 5.1.1) mEq - General
5.1.1.1) mEq from weight/volume Normal 1
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Express the concentration of 0.5 % (w/v) NaCl solution as milliequivalent per liter. The molecular weight of NaCl is 58.5 g/mol
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lb equals 85.47 mEq/L kg
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The molecular weight of NaCl = 58.5.
Valence or charge = 1.
Therefore, we can write: 58.5 mg = 1 mEq.
Again, 0.5 % (w/v) means, 0.5 gram of solute is present per 100 mL of solution. 0.5 g equals 500 mg. Since the question needs mEq/L as the final unit, we keep mEq in the first numerator. So, 58.5 mg will be the denominator.
The strength of the solution (500 mg per 100 mL) will be written such a way that mg is at the numerator of the second fraction.
Therefore, the dimensional analysis will be like this:
`(1 \quad mEq)/(58.5 \quad mg) × (500 \quad mg)/(100 \quad mL) × (1000 \quad mL)/(1 \quad L)=85.47\quad (mEq)/L` Ans.