A 2.5 kg sample of well water holds 0.030 mg of arsenic…
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A sample of well water holds of arsenic. Find the concentration of arsenic in ppb and in ppm. The guideline limit for drinking water is . Is the well water within the limit?
Need a reminder? The key ideaShow
Mass percent . Molarity is moles per litre of solution, and molality is moles per kilogram of solvent. One ppm is of solute in of solution, and one ppb is in . The density joins the mass of a solution to its volume. For dilution, .
The worked solution
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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. Arsenic is in of water.
Step 1. Micrograms. .
Step 2. ppb. , which is .
Step 3. ppm. One ppm is ppb, so .
Answer: or . This is above the limit of , so the well water is not within the guideline.
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