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Author Topic: Na + H2O reaction  (Read 215402 times)

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Linkiroth

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Na + H2O reaction
« on: August 05, 2005, 06:22:10 AM »

What exactly happens, I know that the sodium removes hydrogen... but is the balanced equation:

2Na + H2O ---> H2 + Na2O

or

2Na + 2H2O ---> H2 + 2NaOH

Just a random question I was curious about.
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xiankai

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Re:Na + H2O reaction
« Reply #1 on: August 05, 2005, 06:44:53 AM »

your 2nd reaction is correct.
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sdekivit

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Re:Na + H2O reaction
« Reply #2 on: August 05, 2005, 06:49:24 AM »

metal + water will react according to an redoxreaction:

meta --> metalion + e-

2H2O + 2e-  --> H2 + 2OH(-)
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Linkiroth

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Re:Na + H2O reaction
« Reply #3 on: August 05, 2005, 08:17:12 AM »

That's what I thought. But I was told that the first reaction was correct.
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sdekivit

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Re:Na + H2O reaction
« Reply #4 on: August 05, 2005, 09:28:42 AM »

it's correct too but remember that Na2O in H2O will react in an acid-base-reaction due to the O(2-)-ions:

O(2-) + H2O --> 2OH(-)

thus in a solution:

Na2O + H2O --> 2 NaOH

the total nett reaction will then become the same as the first reaction.

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