Parts per million (ppm)and Parts per billion (ppb)
The only difference in the
calculations of parts per million and parts per billion is factor used to
multiply the ratio. The formulas for these two are:
Parts per million
|
Concentration
|
Amount
of solute
|
|
|
|
=
|
|
|
1,000,000
|
Amount
of solvent
|
Parts per billion
|
Concentration
|
Amount
of solute
|
|
|
|
=
|
|
|
1,000,000,000
|
Amount
of solvent
|
Assignment: Percent, ppm and ppb
1)
Calculate the concentration of salt in a solution of water in percent if 45
grams is dissolved in 1,200 ml of water.
2)
Calculate the mass of solute in a 10% salt solution if the mass of the solvent
is 350 grams.
3)
Calculate the mass of solvent in a 6 ppm solution of a drug if the mass of the
solute is 0.050 milligrams.
4) What
is the concentration in ppm of selenium if 1.3 milligrams is found in 2,500 kg
of soil?
5) What
is the concentration in ppb of PCB's in a chemical spill, if their is 0.060 mg
in 4,600 Kg of soil?
6)
Calculate the mass of solute of hydrogen peroxide in a 35 % solution if 450 ml
of solution is being used.
7)
Calculate the mass of solute PCB's in a 65 Kg person, if the concentration is 4
PPM?
8) What
mass of nickel is in a 2.4 Kg sample of propanol if the concentration is 20
ppb?
9)
Calculate the mass of solvent that would contain 3.0 mg of a drug if the
concentration was 3.5%.
10)
Calculate the concentration in ppm if 8 grams of CaCl2 is dissolved in 250 ml of water.
sir from where do we get the answers?
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