According to the EPA Lead and Copper Rule (LCR), the action level for Pb in drinking water (the level at which threat to human health requires public notification and action towards mitigation) is 15 ppb. If you were to add enough phosphate to the system saturated with respect to Pb3(PO4)2(s), would the [Pb2+] be below the action limit?

The right answer is "105.17 ppb".

Explanation:

According to the question,

The amount of in ppb will be:

=

=

Thus, the amount of is above action limit.

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