| Topic: |
Science > Physics |
| User: |
"iitaspirant2009" |
| Date: |
20 Oct 2006 09:44:24 AM |
| Object: |
Doubt(not related to physics) |
Nitric acid is known to be an oxidising agent so if any metal reacts
with it Hydrogen is not formed but Water is formed and NO3 changes to
NO2 or NO or N2O.
But
K + HCL---> KCl + H
But when Mg and Mn react with it hydrogen is formed why?
Our teacher had this doubt, she asked us to find out. she said she
thought that in the case of manganese it is due to variable valency.
plz give me the correct reason.
.
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| User: "Sorcerer" |
|
| Title: Re: Doubt(not related to physics) |
20 Oct 2006 11:27:27 AM |
|
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"iitaspirant2009" <tarun4physics@gmail.com> wrote in message
news:1161355464.192917.297000@m7g2000cwm.googlegroups.com...
| Nitric acid is known to be an oxidising agent so if any metal reacts
| with it Hydrogen is not formed but Water is formed and NO3 changes to
| NO2 or NO or N2O.
|
| But
|
|
| K + HCL---> KCl + H
|
|
| But when Mg and Mn react with it hydrogen is formed why?
Equations have to balance. There is no "O" on the left side, so
there can be no O on the right.
Mg + HCl -> MGCl + H
BUT! .... really you should write
2Mg + 2HCl -> 2MgCl +H2
because gaseous hydrogen is a molecule, H2.
|
|
| Our teacher had this doubt, she asked us to find out. she said she
| thought that in the case of manganese it is due to variable valency.
|
|
| plz give me the correct reason.
|
.
|
|
|
|
| User: "Dirk Van de moortel" |
|
| Title: Re: Doubt(not related to physics) |
20 Oct 2006 01:37:33 PM |
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|
"iitaspirant2009" <tarun4physics@gmail.com> wrote in message news:1161355464.192917.297000@m7g2000cwm.googlegroups.com...
Nitric acid is known to be an oxidising agent so if any metal reacts
with it Hydrogen is not formed but Water is formed and NO3 changes to
NO2 or NO or N2O.
But
K + HCL---> KCl + H
But when Mg and Mn react with it hydrogen is formed why?
I guess you mean why Mg and Mn don't give H2O and NOx
but give H2 in HNO3 ?
I *think* that this is related to the fact that for instance Zn only
gives H2 in highly diluted H2SO4.
You better put this question in sci.chem.
[followup set]
Dirk Vdm
Our teacher had this doubt, she asked us to find out. she said she
thought that in the case of manganese it is due to variable valency.
plz give me the correct reason.
.
|
|
|
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