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March 26, 2017

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how many grams of NaCl (molecular weight 58.5) should be used to prepare 20 liters of a solution containing 154mEq/L?

  • chemistry - ,

    For NaCl, 1 equivalent is the same as 1 mole.
    154 mEq/L = 0.154 Eq/L = 0.154 mole/L
    So you want g = moles x molar mass = 0.154 x 58.5 = grams/L. For 20 L you want 20x that.

    If you don't want to go through the conversion each time, just remember that
    mEq x milliequivalent weight = grams.
    So you want 154 x 0.0585 = ?? grams and that is in 1L, so 20x that is the amount for 20 L.

  • chemistry - ,

    180.20

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