Multiple Choice
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?
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14. Solutions
Parts per Million (ppm)
Multiple Choice
In water-treatment and food-safety settings, a chemical sanitizer concentration in dilute aqueous solution is most commonly expressed as which unit?
A
Molarity ()
B
Parts per million (ppm)
C
Normality ()
D
Percent by mass ()
Verified step by step guidance1
Understand that the problem asks for the most common unit used to express chemical sanitizer concentration in dilute aqueous solutions, particularly in water-treatment and food-safety contexts.
Recall that molarity (M) and normality (N) are concentration units based on moles of solute per liter of solution, which are useful for many chemical calculations but may not be practical for very dilute solutions.
Recognize that percent by mass (%) expresses concentration as the mass of solute per mass of solution, which is often used for more concentrated solutions rather than very dilute ones.
Learn that parts per million (ppm) is a unit that expresses very dilute concentrations, representing milligrams of solute per liter of solution (mg/L) in aqueous systems, making it ideal for trace levels of sanitizers.
Conclude that because chemical sanitizers in water-treatment and food-safety are typically present at very low concentrations, parts per million (ppm) is the most appropriate and commonly used unit.
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