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Topic: MgCO3 x nH2O => CO2 + ??  (Read 4873 times)

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Offline Evaldas

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MgCO3 x nH2O => CO2 + ??
« on: December 20, 2010, 12:31:38 PM »
What other gas is produced when magnesium carbonate crystalohydrate is heated, other than CO2? That gas is supposed to react with H2SO4
« Last Edit: December 20, 2010, 01:25:31 PM by Evaldas »
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Offline Borek

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Re: MgCO3 x nH2O => CO2 + ??
« Reply #1 on: December 20, 2010, 02:56:40 PM »
Calling it a gas is what gives you troubles. Think what will be left after reaction, and what disappears.
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Offline opti384

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Re: MgCO3 x nH2O => CO2 + ??
« Reply #2 on: December 21, 2010, 02:47:43 AM »
After some practice you'll get the intuition of figuring out the products in a reaction.
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Offline Evaldas

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Re: MgCO3 x nH2O => CO2 + ??
« Reply #3 on: December 21, 2010, 06:16:00 AM »
MgO? What happens to H2O?
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Offline Evaldas

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Re: MgCO3 x nH2O => CO2 + ??
« Reply #4 on: December 21, 2010, 07:20:03 AM »
So is it MgCO3 x nH2O  :rarrow: CO2 + MgO + nH2O?

What are the products of this reaction then:
H2SO4 + CO2?  :rarrow: ?
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Offline AWK

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Re: MgCO3 x nH2O => CO2 + ??
« Reply #5 on: December 21, 2010, 07:29:13 AM »
CO2 does not react with H2SO4, but MgO does. Check carefully source of your question.
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Offline Borek

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Re: MgCO3 x nH2O => CO2 + ??
« Reply #6 on: December 21, 2010, 07:35:08 AM »
What is the reaction setup? Was the acid concentrated, or diluted? What is characteristic of concentrated acid?
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Offline Evaldas

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Re: MgCO3 x nH2O => CO2 + ??
« Reply #7 on: December 21, 2010, 08:01:15 AM »
Quote from: Borek on December 21, 2010, 07:35:08 AM
What is the reaction setup? Was the acid concentrated, or diluted? What is characteristic of concentrated acid?
"Some amount of MgCO3 x nH2O was being heated until there was no more gas produced. The obtained gas was being let through two bowls: one was filled with concentrated sulfuric acid, and the other with calcium hydroxide. During the reaction the first bowl got heavier by 5,4 g, and in the second 10 g of precipitate were formed. Find the formula of the crystalohydrate and find the mass of the broken down salt."
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Offline AWK

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Re: MgCO3 x nH2O => CO2 + ??
« Reply #8 on: December 21, 2010, 08:36:45 AM »
This as an absorption of water vapor, and not reaction. Concentated sulfuric acid is use as water trap.
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Offline Evaldas

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Re: MgCO3 x nH2O => CO2 + ??
« Reply #9 on: December 21, 2010, 09:08:41 AM »
MgCO3 x 3H2O
m = 13.8 g
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