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Posted by on Wednesday, February 15, 2012 at 2:07pm.

35 grams of sodium phosphate are mixed with enough water to make 3.5L of solution having a densityof 1.045g/mol. Find the concentration of sodium phosphate in ppm.
Using the same information, find the molarity of the sodium and phosphate ions.

  • Chemistry - , Wednesday, February 15, 2012 at 2:21pm

    second part:
    moles Na3PO4 = grams/molar mass
    M = moles/L soln

    first part:
    mass soln = 3,500 mL x 1.045 g/mL = about 3657.5 g
    (Note: I think you meant to type 1.045 g/mL for the density and not g/mol).
    So the solution is 35 g in 3657.5 g
    That is 35/3657.5 = about 0.0096 g/g (but you need to do it more accurately). Multiply both numerator an denominator by 1E6 to obtain ppm.

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