April 13, 2021, 03:16:40 AM
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Topic: Problem while balancing an Equation by Redox Method (Ill possed problem?)  (Read 157 times)

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Offline JeanPaulSB

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Hi guys, i have a problem while balancing this equation idk if it is an ill possed problem,  i tried to solve it too many times and i can't get an answer, this equation was assigned by my teacher and need to be solved by redox method.

PH3 + KMnO4 + H2SO4 → K2SO4 + MnSO4 + H3PO4

Trying to solve it, i got this

5PH3+8KMnO4+H2SO4→ K2SO4+8KMnO4+5H3PO4.

I felt so confused with this, pls help me guys :(

« Last Edit: March 15, 2021, 01:10:52 AM by JeanPaulSB »

Offline chenbeier

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Start with redox pair

PH3 to H3PO4
MnO4- to Mn2+

PH3 + 4 H2O => H3PO4 + 8 H+ + 8 e-

MnO4- + 8 H+ + 5 e- => Mn2+ + 4 H2O

Can you work further

Offline Borek

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PH3 + KMnO4 + H2SO4 → K2SO4 + MnSO4 + H3PO4

This equation can't be balanced as written, you need one more product.
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