milliequivalent formula question

  1. 0
    the formula used to convert millimoles to milliequivalents is

    mEq = mmol/L X valence

    How is this used when considering sodium?

    Sodium's atomic weight is 23 mg,
    therefore 23 mg of sodium is 1 mmol of sodium

    a mmol of a substance is the atomic weight in milligrams

    Get the hottest topics every week!

    Subscribe to our free Nursing Insights: Student Edition newsletter.

  2. 2 Comments...

  3. 0
    Quote from GingerSue
    the formula used to convert millimoles to milliequivalents is

    mEq = mmol/L X valence

    How is this used when considering sodium?

    Sodium's atomic weight is 23 mg,
    therefore 23 mg of sodium is 1 mmol of sodium

    a mmol of a substance is the atomic weight in milligrams
    http://www.merck.com/mmpe/appendixes/ap1/ap1a.html

    "The following can be used to convert between mEq, mg, and mmol:

    mEq = mg/formula wt valence = mmol valence

    mg = mEq formula wt /valence = mmol formula wt

    mmol = mg/formula wt = mEq/valence

    (Note: Formula wt = atomic or molecular wt.)"
    So, for Sodium:
    1 mEq = 23mg/23 (formula wt) x 1 (valence) = 1mmol x 1 (valence)
    23mg = 1mEq x 23 (formula wt) /1 (valence) = 1mmol x 23 (formula wt)
    1mmol = 23mg/23 (formula wt) = 1mEq/1 (valence)

    Calcium has a formula weight of 40, and a valence of 2, so:
    2 mEq = 40mg/40 (formula wt) x 2 (valence) = 1mmol x 2 (valence)
    20mg = 1mEq x 40 (formula wt) /2 (valence) = 0.5mmol x 40 (formula wt)
    1mmol = 40mg/40 (formula wt) = 1mEq/2 (valence)
    40mg of Ca = 2 mEq
    1mmol of Ca = 0.5 mEq
    1 mEq of Ca = 20mg
  4. 0
    thanks, I'll try to figure this out


Nursing Jobs in every specialty and state. Visit today and Create Job Alerts, Manage Your Resume, and Apply for Jobs.

A Big Thank You To Our Sponsors
Top