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Topic: Quantitative analysis using volumetry and gravimetry  (Read 2111 times)

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Offline Shadow

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Quantitative analysis using volumetry and gravimetry
« on: November 24, 2015, 01:14:52 PM »
You need to determine the quantitative composition of the following mixture: KCl, ZnCO3, BaSO4, PbSO4 and inert impurities. How to do this using only volumetry and gravimetry? I'm lost. I thought about complexometric determination of zinc(II), but barium and lead will interfere.
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Offline Borek

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Re: Quantitative analysis using volumetry and gravimetry
« Reply #1 on: November 24, 2015, 02:36:42 PM »
I would first separate soluble from insoluble, then those reacting with the sulfuric acid from those not reacting.
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Offline Shadow

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Re: Quantitative analysis using volumetry and gravimetry
« Reply #2 on: November 24, 2015, 03:09:35 PM »
But lead sulfate would partially be transformed to lead hydrogen sulfate.
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Offline GCMASTER

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Re: Quantitative analysis using volumetry and gravimetry
« Reply #3 on: January 06, 2016, 07:26:57 PM »
1. wash with water to isolate KCl
2. treate with Hcl to achieve ZnCl2 , dry it and isolate by wasing with water
3. treate with KOH at 80C  - Pb(OH)2 will  precipitate
4. treate the mix of Ba(OH)2 and KOH with H2SO4 and dry it
5. wash out the K2SO4 with water - that's all 8)

Good luck ;D
« Last Edit: January 06, 2016, 07:41:09 PM by GCMASTER »
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