Concept explainers
Drinking water may contain a low concentration of lead ion,
(a) What is the concentration of lead ion in the tap water in units of ppb? Is it safe to drink?
(b) What is the concentration of lead ion in units of units of mg/mL?
(c) What mass of lead ion is in 100.0 mL of this drinking water?
(d) How many moles of lead ion are in 100.0 mL of the water?
(a)
Interpretation:
The concentration of
Explanation of Solution
Explanation:
Given Information: The concentration of lead ions in tap water,
Parts per million is the ratio of the mass of solute and the mass of solution multiplied by
Parts per billion is the ratio of the mass of solute and the mass of solution multiplied by
Divide equation (2) by equation (1), to get the following relationship:
Substitute the ppm value in equation (3), to obtain the ppb value as follows:
Thus, the
Since EPA has determined the maximum permissible level of
(b)
Interpretation:
The concentration of lead ions in
Explanation of Solution
Given Information: The
Parts per million is the ratio of the mass of solute and the mass of solution multiplied by
Since
So, the above equation can be written in the following manner also:
It is given that the
Hence the concentration of lead ions in
(c)
Interpretation:
The mass of lead ions present in
Explanation of Solution
Given Information:
The mass of lead ions present in
So, the mass of lead ions present in
(d)
Interpretation:
The moles of lead ions present in
Explanation of Solution
Given Information: The mass of lead ions is
The number of moles is calculated as follows:
Hence,
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