Question about balancing a reaction

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Discussion Overview

The discussion revolves around the balancing of a chemical reaction involving phosphoric acid (H3PO4), potassium permanganate (KMnO4), sulfuric acid (H2SO4), manganese sulfate (MnSO4), potassium sulfate (K2SO4), and water (H2O). Participants explore the feasibility of balancing this reaction and the implications of having the same compound as both a reagent and a product.

Discussion Character

  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant requests help in balancing the reaction and questions why it cannot be balanced, as well as the significance of having the same compound on both sides.
  • Another participant asserts that the reaction is not valid, stating that manganese is being reduced without a corresponding oxidation process.
  • A subsequent participant defends the validity of the reaction, claiming their teacher insists it is correct.
  • Another participant challenges the validity of the reaction by questioning what the permanganate is oxidizing.
  • One participant provides a detailed explanation of the balancing issue, noting that there are five elements that must match on both sides and that there are insufficient degrees of freedom to balance the equation, likening it to an unsolvable system of equations.

Areas of Agreement / Disagreement

Participants express disagreement regarding the validity of the reaction and whether it can be balanced. Multiple competing views remain, with some insisting the reaction is correct and others asserting it is not.

Contextual Notes

There are unresolved assumptions regarding the correctness of the reaction as presented and the implications of balancing it, particularly concerning the roles of oxidation and reduction.

yuval12
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Homework Statement
balancing a reaction
Relevant Equations
H3PO4(aq) + KMnO4(aq) + H2SO4(aq) → H3PO4(aq) + MnSO4(aq) + K2SO4(aq) + H2O(l)
hi,

I was asked to balance this reaction :

H3PO4(aq) + KMnO4(aq) + H2SO4(aq) → H3PO4(aq) + MnSO4(aq) + K2SO4(aq) + H2O(l)

can I get some help? why we can't balance this reaction? and what can we say about a reaction that has the same compound as a reagent and a product?
thank you
 
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That's not a reaction. Mn is being reduced, but nothing is being oxidised. Have you copied it correctly?
 
yes, our teacher insists that there is no mistake in the reaction
 
I assure you there is. What is the permanganate oxidising?
 
You were told exactly the same at other forum, weren't you?
 
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yuval12 said:
Relevant Equations:: H3PO4(aq) + KMnO4(aq) + H2SO4(aq) → H3PO4(aq) + MnSO4(aq) + K2SO4(aq) + H2O(l)

why we can't balance this reaction?
Ignoring H3PO4(aq) which needs to stay balanced (only chemical with P) you have five elements, K, Mn, H, S, O, that have to match on both sides -> 5 equations. You have five chemicals there, which gives you four degrees of freedom to try to balance the equation (the fifth is just an overall scaling of the reaction). There is no solution to that problem here. It's like trying to solve "x=5 and x=7". Find x such that both equations are satisfied. You can't.
 

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