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Author Topic: Solution problem  (Read 945 times)

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sega18

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Solution problem
« on: February 02, 2012, 12:33:09 PM »

An unknown solid compound containing Pb2+ ion was mixed with 15 mL of 2.0 M HNO3. The
mixture bubbled profusely. After complete reaction, it was found that 0.020 moles of CO2 were
produced and the original solid was completely consumed.
a) What is the chemical formula of the unknown solid?
b) Write a balanced net ionic equation for this reaction.
c) Calculate the mass of the original unknown solid.


How am I supposed to know that the solid is Lead(II) Hydrogen Carbonate and not Lead(II) Carbonate?
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Arkcon

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Re: Solution problem
« Reply #1 on: February 02, 2012, 02:03:29 PM »

As written, I don't see how.  They should have given you a mass of solid.
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Borek

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Re: Solution problem
« Reply #2 on: February 02, 2012, 09:46:45 PM »

While I agree question is ambiguous, I doubt bicarbonate exists. pKsp for PbCO3 is around 13, so it would most likely precipitate from solutions containing Pb2+ and HCO3-.
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AWK

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Re: Solution problem
« Reply #3 on: February 02, 2012, 10:13:10 PM »

Except carbonate, lead forms also a few basic carbonates that are insoluble in water. Hence mass of sample is needed.

http://en.wikipedia.org/wiki/Lead_carbonate
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