Parts per Million Concentration

Parts per Million Concentration• Parts per Million (ppm) is the ratio of the number of

grams of solute for every one million grams of solution .

parts per million = grams of solute x 1000000

grams of solution

Ex.1) What is the number of ppm of NaCl in the solution with 117 g of NaCl dissolved in 500. mL of water?

ppm = g solute x 1000000

g sol’n

x = ______ x 1000000

117 g

617 g

x = 190000 ppm

Parts per Million ConcentrationEx.2) What is the number of ppm of C2H4(OH)2 in the

solution with 55.5 g (50.0 mL) of liquid C2H4(OH)2 dissolved in 150.0 mL of water ?

ppm = g solute x 1000000

g sol’n

x = __________ x 1000000

55.5 g205.5 g

x = 270000 ppm

Parts per Million ConcentrationEx.3) If 3.0 mg (0.0030 g) of Cr+6 is dissolved in 3.0000 L

(3000.0 mL) of water what is the concentration of the hexavalent chromium (Cr+6) in ppm?

ppm = g solute x 1000000

g sol’n

x = ____________ x 10000000.0030 g

3000.0030 g

x = 1.0 ppm