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A sample of 100 g red ink contains 0.4 % red pigment. Calculate the concentration of the pigment in ppm.

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A sample of 100 g red ink contains 0.4 % red pigment. Calculate the concentration of the pigment in ppm.
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1 Answer

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by (58 points)
Concentration in ppm = Mass of solute/Mass of solution x 106
= 0.4/100.4 x 106
= 0.00039 x 106= 3.9 x 102 ppm
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