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Topic: Single Replacement Reaction, Zinc Nitrate and Magnesium  (Read 16152 times)

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Xeoning1

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Single Replacement Reaction, Zinc Nitrate and Magnesium
« on: March 04, 2006, 03:21:22 PM »
Hi there, Why does Zinc Nitrate (aqueous) not react with Magnesium (solid) ?? I know it has something to do with the activity series but I cant exactly figure it out.


Help would be awesome, thanks :D

Xeoning1

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Magnesium and Zinc Nitrate
« Reply #1 on: March 04, 2006, 04:21:30 PM »
Why does Zinc Nitrate (aqueous) not react with Magnesium (solid) ?? I know it has something to do with the activity series but I cant exactly figure it out. I tried this in an experiment. I believe it has to do with Magnesium Oxide that forms ontop of the Magnesium that doesnt allow the single replacement reaction to occur. any help would be awesome to explain this or help me further understand

crazybouttennis

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Re:Single Replacement Reaction, Zinc Nitrate and Magnesium
« Reply #2 on: March 04, 2006, 10:23:16 PM »
I'm not positive, but I think magnesium would react with zinc nitrate to form magnesium nitrate and zinc because magnesium is higher on the activity series of elements than zinc so magnesium should be able to react with zinc nitrate.

Offline Albert

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Re:Magnesium and Zinc Nitrate
« Reply #3 on: March 05, 2006, 05:27:38 AM »
I believe it has to do with Magnesium Oxide that forms ontop of the Magnesium that doesnt allow the single replacement reaction to occur.

I think it's magnesium hydroxide rather than oxide.

Xeoning

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Re:Single Replacement Reaction, Zinc Nitrate and Magnesium
« Reply #4 on: March 06, 2006, 08:07:37 PM »
Yes You are correct  but when Magnesium is exposed to air it forms MgO (Magnesium Oxide) I Believe this plus its relativity to Zinc on the acticity series helps to explain why it doesnt react. Any more light shed on this would be great

Xeoning

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Re:Magnesium and Zinc Nitrate
« Reply #5 on: March 06, 2006, 08:09:27 PM »
Nonono. When Magnesium pure magnesium is exposed to air it forms MgO, it oxidizes readily in air. If a small peice of Magnesium ribbon is placed in Zinc Nitrate, I think this is what stops the single placement reaction from occuring, and it makes it into a double replacement which cannot be completed. Not sure though.

Offline AWK

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Re:Single Replacement Reaction, Zinc Nitrate and Magnesium
« Reply #6 on: March 07, 2006, 01:10:58 AM »
Magnesium , even with water, reacts only after warming to boil. I think this will be work also in this case, but this reaction may be more complex.. In this case zinc can react with water or nitrates.
« Last Edit: March 07, 2006, 01:38:05 AM by AWK »
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