Valence States of Chromium and Silver in Net Ionic Equations: Which One to Use?

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Discussion Overview

The discussion revolves around determining the appropriate valence state of chromium when writing a net ionic equation involving chromium and silver nitrate. Participants explore the implications of using different valence states (+2, +3, +6) and the conditions under which these reactions occur.

Discussion Character

  • Homework-related
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant presents two possible net ionic equations for chromium using valence states +2 and +3, expressing confusion about which to use.
  • Another participant suggests comparing the potentials of half reactions, recommending the use of Cr3+ as the preferred state.
  • A later reply questions whether the proposed reactions would occur based on the activity series, asserting that neither reaction would take place.

Areas of Agreement / Disagreement

Participants do not reach a consensus on which valence state to use for chromium, as there are competing views regarding the appropriate conditions for the reactions.

Contextual Notes

The discussion highlights the dependency on the activity series and the potential for different outcomes based on the chosen valence state, but does not resolve the implications of these factors.

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Homework Statement


I have to write a net ionic equation for Cr and silver nitrate, but I am confused on which valence state to use, since Cr has multiple valence states ie +2, +3 and + 6.2. The attempt at a solution
If I use the valence state of +2 I end up with:
Cr(s) + 2 Ag+(aq) = 2 Ag (s) + Cr2+(aq)

But if I use +3 I end up with:
Cr(s) + 3Ag+(aq) -> 3Ag(s) + Cr3+(aq)

So which one do I use? and is there a rule to follow?

Thanks.
 
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In general you should compare potentials of half reactions. In this case go for Cr3+.
 
Borek said:
In general you should compare potentials of half reactions. In this case go for Cr3+.

Thanks borek. :)

Another quick question. Neither of these reactions would occur correct?

1.Au + HCl
No reaction since Au is below H2 in the activity series.

2.Ni + Ca(C2H3O2)2 (Ca acetate)
No reaction since Ni is below Ca in the activity series.
 
2xOK
 
Thanks.
 

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