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March 28, 2017

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If im given mass percent and mass solvent how do I find mass solute and mass solution.
example: Mass percent = 3.8% and Mass solvent 45.8 g.
Find mass solute and mass solution

  • chemistry - ,

    You can do it one of two ways but both are mathematically the same.
    Let X = mass solute.
    (X)/(X+45.8) = 0.038 and solve for X.
    X = solute and
    X+45.8 = mass soln.

    The other way is just as easy.
    3.80% w/w means 3.80g solute/100 g soln = 3.80g/(3.80+96.2)
    Since you have 45.8 g solvent, then
    3.80 x (45.8/96.3) = 1.809g solute (I know that's too many significant figures).
    You can check that.
    [1.809/(1.809+45.8)]*100 = 3.80%
    mass soln = 1.809+45.8 = ?

  • chemistry - ,

    where did you get the 96.2

  • chemistry - ,

    A 3.80% w/w solution means 3.80 g solute in 100 g soln. The 100 g solution consists of 3.80 g solute and water(solvent) so the solvent must be 100-3.80 = 96.2g.

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