PPM and PPB A 180-mg sample of Na2CO3 is dissolved in H2O to give 2.80L of solution. What is the concentration of Na+ in parts per million (ppm)? Note: "ppm" are 106 ×[(mass of solute)/(mass of solution)] ppm 1pts Tries 0/5 A 2.15-mg sample of dioctyl phthalate (C24H38O4), a plasticizer, is dissolved in H2O to give 550mL of solution. What is the concentration of dioctyl phthalate in parts per billion (ppb)? Assume U.S. definition of "one billion" = 109 (as opposed to British 1012). ppb 1pts
Ans :
A)
ppm = ( mass of solute / mass of solution ) x 106
here the mass of solute is 180 mg and mass of solution is almost 2.80 kg = 2.8 x 106 mg
So concentration in ppm :
= ( 180 / 2.8 x 106) x 106
= 64.3 ppm
B)
mass of solute = 2.15 mg
mass of solvent is almost 550 g = 5.5 x 105 mg
ppb = ( mass of solute / mass of solvent) x 109
= ( 2.15 / 5.5x105) x 109
= 3910 ppb
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A 1.95-mg sample of dioctyl phthalate (C24H38O4), a plasticizer, is dissolved in H2O to give 640mL of solution. What is the concentration of dioctyl phthalate in parts per billion (ppb)?
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