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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: soosterling on December 08, 2008, 05:27:53 AM

Title: chemistry
Post by: soosterling on December 08, 2008, 05:27:53 AM
What is the OXIDIZING AGENT in the following reaction?

3H2S+2HNO3-->3S+2NO+4H20

a) H2S

b) HNO3

c) S

d) NO

e) H2O
Title: Re: chemistry
Post by: macman104 on December 08, 2008, 05:28:38 AM
Quote from: soosterling on December 08, 2008, 05:27:53 AM
What is the OXIDIZING AGENT in the following reaction?

3H2S+2HNO3-->3S+2NO+4H20

a) H2S

b) HNO3

c) S

d) NO

e) H2O
Can you assign oxidation states to each of the elements in the reaction?
Title: Re: chemistry
Post by: soosterling on December 08, 2008, 05:45:28 AM
S -2
NO-1
H2O+1
Title: Re: chemistry
Post by: macman104 on December 08, 2008, 05:48:56 AM
Quote from: soosterling on December 08, 2008, 05:45:28 AM
S -2
NO-1
H2O+1

Close, but assign oxidation states for each element in every single compound, so something like this:

H2S...
H:
S:

HNO3...
H:
N:
O:

etc...
Title: Re: chemistry
Post by: soosterling on December 08, 2008, 06:00:47 AM
oh ok. Thank you. So the oxidizing agent would be H2S because S-2 increases to S(0) in S right?
Title: Re: chemistry
Post by: macman104 on December 08, 2008, 06:17:34 AM
Not quite, what is the definition of an oxidizing agent?  Does it take or give electrons in the process?  If it gives electrons, will oxidation increase or decrease?  Which element fits these criteria?
Title: Re: chemistry
Post by: soosterling on December 08, 2008, 06:26:33 AM
The oxidizing agent is the reactant that contains the element reduced.
The N is going from an oxidation state of +5 in HNO3 to an oxidation state of +2 in NO. SO, each N atom is gaining 3 electrons.
Title: Re: chemistry
Post by: macman104 on December 08, 2008, 06:27:34 AM
So what is your oxidizing agent then?
Title: Re: chemistry
Post by: soosterling on December 08, 2008, 06:28:18 AM
NO?
Title: Re: chemistry
Post by: macman104 on December 08, 2008, 06:29:38 AM
Quote from: soosterling on December 08, 2008, 06:28:18 AM
NO?
Close, that is the product of the redox reaction.  What is the compound that provides the element that is oxidized on the reactants side?
Title: Re: chemistry
Post by: soosterling on December 08, 2008, 06:31:05 AM
HNO3 is my final answer. If I don't get this right I don't understand the problem and will ask my teacher.
Title: Re: chemistry
Post by: macman104 on December 08, 2008, 06:36:30 AM
That is exactly right, well done!

Feel free to post another and check your answers.
Title: Re: chemistry
Post by: soosterling on December 08, 2008, 06:38:27 AM
WOW, thank you for helping me understand the problem
Title: Re: chemistry
Post by: Saulothiago on December 09, 2008, 05:42:21 PM
Hi, I'm From Brazil ;x

N' I Reeeeeeeaaly need Help,

Tomorrow will be my exam and there's one question I have to know,

Can you help me ?

Bi2O3 + NaOH + NaClO --> NaBiO3 + NaCl + H2O

I Must Balance it By Oxireduction But I Don't Know How, 'Cause the Tradicional Method is not Workin' with it ;x
Title: Re: chemistry
Post by: Borek on December 09, 2008, 05:53:07 PM
http://www.chembuddy.com/?left=balancing-stoichiometry&right=balancing-redox

http://www.chembuddy.com/?left=balancing-stoichiometry&right=half-reactions-method

http://www.chembuddy.com/?left=balancing-stoichiometry&right=oxidation-numbers-method