Topic: Making Anhydrous MgCl2 (Read 8548 times)

kpcsmcri · « **on:** November 29, 2005, 11:04:04 AM »

Please help me by answering this.

woelen · « **Reply #1 on:** November 30, 2005, 08:21:47 AM »

I'm afraid you can't. Many hydrated metal salts, when heated, do not only loose water, but also acid. So, in your case you may end up with HCl fumes, water vapor and MgO as a residue.

I'm not sure about MgCl2.6H2O, but I know a similar thing happens with MANY hydrated metal salts, e.g. FeCl3.6H2O, Mg(NO3)2.6H2O, AlCl3.6H2O, Cu(NO3)2.3H2O. They all loose acid on heating, leaving a basic metal salt at best or being completely decomposed to the oxide/hydroxide.

science2000 · « **Reply #2 on:** November 30, 2005, 08:56:45 PM »

But couldn't anhydrous H2SO4 "pull" the water molecules safely out of hydrated magnesium chloride? I've seen it added to sugar, and it pulls the water out of it leaving behind carbon. it's a powerful dehydrating agent.

AWK · « **Reply #3 on:** December 01, 2005, 05:44:43 AM »

You can obtain anhydrous crystals of {Mg(NH3)6]Cl2. They loss ammonia during warming. This method is patented

woelen · « **Reply #4 on:** December 02, 2005, 06:17:00 AM »

Quote from: science2000 on November 30, 2005, 08:56:45 PM

But couldn't anhydrous H2SO4 "pull" the water molecules safely out of hydrated magnesium chloride? I've seen it added to sugar, and it pulls the water out of it leaving behind carbon. it's a powerful dehydrating agent.

This won't work, you also loose your chloride and impure MgSO4 is left behind. Gaseous HCl will escape. The same thing happens when NaCl is added to H2SO4.

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How Can I make Anhydrous MgCl2 from MgCl2 6H2O

Topic: Making Anhydrous MgCl2 (Read 8548 times)

kpcsmcri

Making Anhydrous MgCl2

woelen

Re:Making Anhydrous MgCl2

science2000

Re:Making Anhydrous MgCl2

AWK

Re:Making Anhydrous MgCl2

woelen

Re:Making Anhydrous MgCl2

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