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Topic: Chemical equation for a precipitate?  (Read 2612 times)

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Offline cabaal

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Chemical equation for a precipitate?
« on: September 03, 2010, 03:50:46 PM »
"What amount of NaI is needed to precipitate 3 g of Pb(NO3)2? What weight of PbI2 is formed?"

I can do the stoichiometry, I just can't figure out an equation. Where did the sodium go and what's my course of lead and nitrate?

NaI + ?  :rarrow: Pb(NO3)2 (s) + PbI2

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Offline cabaal

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Re: Chemical equation for a precipitate?
« Reply #1 on: September 03, 2010, 04:22:46 PM »
I meant to say what's my SOURCE of lead and nitrate ions.
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Offline Borek

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Re: Chemical equation for a precipitate?
« Reply #2 on: September 03, 2010, 05:32:10 PM »
Are you sure you are not asked to precipitate all the lead from the lead nitrate solution containing 3 g of the salt?
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Offline cabaal

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Re: Chemical equation for a precipitate?
« Reply #3 on: September 03, 2010, 06:00:37 PM »
Ahh, I see what you're saying. Thank you Borek.
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