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Topic: Precipitation Problem  (Read 1553 times)

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Offline cloudy1290

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Precipitation Problem
« on: May 28, 2019, 06:47:36 AM »
There is an aqueous solution containing Cu2+ and Pb2+ ions. The most suiable reagent to precipitate one of the two ions from the solution is

1) nitric acid 2) sodium carbonate 3) sulfuric acid 4) hydrogen sulfide

The answer key is 3) sulfuric acid. My point is why it isn't hydrogen sulfide as it can precipitate Cu2+
« Last Edit: May 28, 2019, 07:13:29 AM by cloudy1290 »
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Offline mjc123

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Re: Precipitation Problem
« Reply #1 on: May 28, 2019, 08:07:42 AM »
It will precipitate lead as well.
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Offline cloudy1290

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Re: Precipitation Problem
« Reply #2 on: May 28, 2019, 08:19:35 AM »
Quote from: mjc123 on May 28, 2019, 08:07:42 AM
It will precipitate lead as well.

H2S precipitate Pb2+ too?
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Offline Borek

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Re: Precipitation Problem
« Reply #3 on: May 28, 2019, 09:40:58 AM »
What do solubility rules say about solubility of sulfides?
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Offline cloudy1290

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Re: Precipitation Problem
« Reply #4 on: May 28, 2019, 10:20:18 AM »
Quote from: Borek on May 28, 2019, 09:40:58 AM
What do solubility rules say about solubility of sulfides?

thanks :)
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