Question

Notati coeficientii reactiilor redox

a) P + HNO3 + H2O ----> NO + H3PO4

b) S + HNO3 ----> NO + H2SO4

c) KMnO4 + H2S + HCl -----> KCl + MnCl2

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Answer 1

Răspuns:

a) 3P+ 5HNO3 +2H2O =>5NO+3H3PO4

P⁰ - 5e- =>  P⁵ (oxidareagent reducator)×3

 N⁵ + 3e- =>N² (reducereagent oxidant)×5

P⁰ - 15e- =>  P⁵

 N⁵ + 15e- =>N²

b) S+2 HNO3 ----> 2NO + H2SO4

S⁰ - 6 e- => S⁶ (oxidareagent reducator )

2 N⁵ + 6 e- => 2 N³(reducere agent oxidant)

c) 2 KMnO4 + 6 HCl + 5 H2S =>2 KCl + 2 MnCl2  + S + 8H2O 

2 Mn⁷ + 10 e- =>  2 Mn²(reducere agent oxidant )

5 S-² - 10 e- => 5 S⁰ (oxidareagent reducator )