Solving Chemistry Problem: As + HNO3 -> H3AsNO4 + NO2 + H2O

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Discussion Overview

The discussion revolves around a chemistry problem involving the reaction of arsenic (As) with concentrated nitric acid (HNO3) to produce a compound that includes arsenic, nitrogen dioxide (NO2), and water (H2O). Participants are attempting to balance the chemical equation and understand the oxidation states of the elements involved.

Discussion Character

  • Homework-related
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant presents an attempt at balancing the reaction and calculating electron transfer, expressing uncertainty about the correctness of their approach.
  • Another participant questions the formula of the arsenic-containing product, suggesting that it may be incorrect and inquiring about the oxidation number of arsenic after oxidation.
  • A participant reiterates the concern about the formula of H3AsNO4, stating that it may not correspond to a valid compound and that the equation may not be balanced.
  • Further discussion includes a participant acknowledging their understanding of how to calculate oxidation numbers but expressing confusion about the implications of the oxidation state of nitrogen not changing during the reaction.

Areas of Agreement / Disagreement

Participants express disagreement regarding the validity of the proposed product formula and the balancing of the equation. There is no consensus on the correct approach to the problem or the oxidation states involved.

Contextual Notes

Participants note the potential for errors in the chemical formula and the balancing of the equation, as well as the need for clarity on oxidation numbers, which may depend on specific rules that are not fully articulated in the discussion.

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Homework Statement



As + HNO3 (consentrated) -> H3AsNO4 + NO2 + H2O

Homework Equations



none

The Attempt at a Solution



I tried doing the electron equation:

As (0) - 1 electron = As (1+) | 1
N (5+) + 1 electron = N (4+) | 1

I don't know if this is right. (The last 2 numbers are supposed to represent the numbers which should go in the equation before those elements.)
Think the oxydation level is supposed to change, but the sides don't balance out. What am I doing wrong? I just can't get this out of my head anymore.

Thanks in advance,
fawk3s
 
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What is formula of your As containing product? Seems to me something is wrong with the way you wrote it in the equation. What is ON of As after oxidation?

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Borek said:
What is formula of your As containing product? Seems to me something is wrong with the way you wrote it in the equation. What is ON of As after oxidation?

Im not sure actually. The equation was given like that and I am not even sure what the oxydation levels are supposed to be.
My task was only to balance the sides.
 
Borek said:
As far as I can tell formula of H3AsNO4 is wrong (no such compound) and equation can be not balanced.

Oxidation numbers you can easily calculate following simple rules.

Yeah, that would explain why I can't figure it out still after trying for an hour or so.

And yes, I know how to calculate the oxidation numbers, but if the oxidaton number of N didnt change during the reaction, then As has to be 0. And that would be odd.

Anyways, thanks for the help !
 

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