Open Question
The maximum amounts of lead and copper allowed in drinking water are 0.015 mg/kg for lead and 1.3 mg/kg for copper. Express these values in parts per million, and tell the maximum amount of each (in grams) allowed in 100 g of water.
9. Solutions
Parts per Million (ppm)
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Glucose makes up about 0.102% by mass of human blood. Calculate this concentration in ppm.
A
102 ppm
B
0.102 ppm
C
0.00102 ppm
D
1020 ppm
Verified step by step guidance1
Understand that ppm (parts per million) is a way of expressing very dilute concentrations of substances. It is equivalent to milligrams of solute per liter of solution (mg/L) when the density of the solution is similar to water.
Recognize that a percentage by mass is a ratio of the mass of the solute to the mass of the solution, multiplied by 100. Here, 0.102% means 0.102 grams of glucose per 100 grams of blood.
Convert the percentage to ppm by recognizing that 1% is equivalent to 10,000 ppm. This is because 1% is 1 part per 100, and ppm is parts per million, so you multiply by 10,000 to convert.
Apply the conversion: multiply 0.102% by 10,000 to convert the percentage to ppm.
Verify the calculation by considering the units and ensuring that the conversion from percentage to ppm is consistent with the definition of ppm.
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