Open Question
Uric acid, the principal constituent of some kidney stones, has the formula C₅H₄N₄O₃. In aqueous solution, the solubility of uric acid is only 0.067 g/L. Express this concentration in (m/v)%, in parts per million, and in molarity.
9. Solutions
Parts per Million (ppm)
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The average human body contains about 5,000 grams of blood. What mass of arsenic is present in the body if the amount in blood is 0.86 ppb?
A
5.8 x 1012 g
B
4.3 x 1012 g
C
4.3 x 10-6 g
D
5.8 x 10-6 g
Verified step by step guidance1
Understand the concept of parts per billion (ppb). It is a unit of measurement that describes the concentration of one substance in a billion parts of another. In this case, 0.86 ppb means 0.86 grams of arsenic per 1 billion grams of blood.
Convert the total mass of blood from grams to the same scale as ppb. Since 1 ppb is equivalent to 1 gram per 1 billion grams, you need to express 5,000 grams of blood in terms of billion grams. This is done by dividing 5,000 grams by 1 billion (1,000,000,000).
Calculate the mass of arsenic in the blood. Multiply the concentration of arsenic (0.86 ppb) by the mass of blood expressed in billion grams. This will give you the mass of arsenic in grams.
Set up the equation: Mass of arsenic = (0.86 grams/billion grams) * (5,000 grams / 1,000,000,000 grams).
Solve the equation to find the mass of arsenic in the blood. This will give you the final answer in grams.
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