Why Na & K are Not Acceptable for Reducing PbCl2

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Discussion Overview

The discussion centers around the question of why sodium (Na) and potassium (K) are not acceptable for reducing lead(II) chloride (PbCl2) in a chemical reaction, particularly in the context of a homework problem. The scope includes theoretical considerations related to chemical reactivity and the activity series of metals.

Discussion Character

  • Homework-related
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant suggests that cost could be a reason for preferring other metals over sodium or potassium.
  • Another participant notes that based on the activity series, metals like iron and magnesium should be able to displace Pb2+ in a single displacement reaction.
  • It is proposed that the validity of the metal chlorides may play a role, as FeCl2 and MgCl2 are valid formulas, while NaCl2 and KCl2 are not, leading to the equation PbCl2 + 2Na --> Pb + 2NaCl.
  • A later reply reiterates the point about the activity series and the validity of the metal chlorides, emphasizing that the original question does not specify any recommendations regarding the choice of reducing agents.

Areas of Agreement / Disagreement

Participants express differing views on the reasons why Na and K are not suitable for the reduction of PbCl2, with some focusing on cost and others on the chemical validity of the products formed. The discussion remains unresolved regarding the definitive reasons for the acceptability of certain metals over others.

Contextual Notes

The discussion highlights assumptions about the activity series and the chemical validity of metal chlorides, which may not be fully explored or agreed upon by all participants.

Faiq
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Homework Statement


A question asked to write an equation for the reduction of PbCl2

The answer key was
PbCl2+X ----> Pb+XCl2
where X can be: ...Fe, Mg...but not Na or K

Why are Na or K not acceptable?
 
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Cost could be one reason. And which would you rather work with: sodium / potassium vs. iron / magnesium?
 
Based on the activity series, all of those metals should be able to displace Pb2+ in a single displacement reaction. Maybe it just has to do with the fact that FeCl2 and MgCl2 are valid formula but NaCl2 and KCl2 are not (rather the equation would be PbCl2 + 2Na --> Pb + 2NaCl).
 
Ygggdrasil said:
Based on the activity series, all of those metals should be able to displace Pb2+ in a single displacement reaction. Maybe it just has to do with the fact that FeCl2 and MgCl2 are valid formula but NaCl2 and KCl2 are not (rather the equation would be PbCl2 + 2Na --> Pb + 2NaCl).

The question doesn't make any such type of recommendation though
 

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