Multiple Choice
What is the concentration of 0.5 g KCl in 3000 g of water in parts per million (ppm)?
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14. Solutions
Parts per Million (ppm)
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If the concentration of fluoride ions in a nearby river is 14 ppm, how many milligrams of fluoride ions are present in 1 liter of river water?
A
140 mg
B
1.4 mg
C
14 mg
D
0.14 mg
Verified step by step guidance1
Understand that ppm (parts per million) in water is equivalent to mg of solute per liter of water because 1 liter of water has a mass of approximately 1,000,000 mg.
Recognize that 14 ppm means there are 14 mg of fluoride ions in every 1,000,000 mg (or 1 liter) of water.
Since the problem asks for the amount of fluoride ions in 1 liter of river water, directly use the ppm value as mg per liter.
Therefore, the mass of fluoride ions in 1 liter of river water is equal to 14 mg.
No further calculations are needed because ppm in dilute aqueous solutions can be treated as mg/L.
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