Problem: Lead glass contains 18-40% by mass of PbO (instead of CaO in regular glass). Lead glass is still used industrially, but lead crystal drinking goblets are no longer considered safe, as the lead may leach out and cause toxic responses in humans. A particular 269-g lead crystal goblet that holds 550 mL of liquid is 37 % PbO by mass, and it leaches 3.1 micrograms of lead every time it is filled.  How many grams of sodium sulfide would be required to decontaminate all the lead in the entire goblet. Express your answer using two significant figures.

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We are asked how many grams of sodium sulfide would be required to decontaminate all the lead in the entire goblet.


PbO + Na2S → 2 PbS + Na2O


Molar mass  PbO = 223.3 g/mol

Molar mass  Na2S = 78.04 g/mol


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Problem Details

Lead glass contains 18-40% by mass of PbO (instead of CaO in regular glass). Lead glass is still used industrially, but lead crystal drinking goblets are no longer considered safe, as the lead may leach out and cause toxic responses in humans. A particular 269-g lead crystal goblet that holds 550 mL of liquid is 37 % PbO by mass, and it leaches 3.1 micrograms of lead every time it is filled.  


How many grams of sodium sulfide would be required to decontaminate all the lead in the entire goblet. Express your answer using two significant figures.

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