Subiecte licenta 2013 ISAPM
Subiecte licenta 2013 ISAPM
Subiecte licenta 2013 ISAPM
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a) MnO4 + 5e + 8H Mn 2 + 4H2O<br />
5¦ ½ I2 + e I<br />
5I + MnO4 + 8H 5/2I2 + Mn 2 + 4H2O + 3(2K + SO4 2 )<br />
K K 4SO4 2 SO4 2<br />
b) NO3 + Al ⎯⎯→ −<br />
HO<br />
NH3 + [Al(OH)4]<br />
3¦ NO3 + 8e + 6H2O NH3 + 9HO<br />
8¦ [Al(OH)4] + 3e Al + 4HO<br />
3NO3 + 8Al(s) + 5HO + 18H2O 8[Al(OH)4] + 3NH3(g)<br />
Na Na Na<br />
5. Prin ecuaţii chimice (echilibre) să se completeze schema de reacţii:<br />
[Cu(OH2)4] 2+<br />
⎯⎯⎯→<br />
−<br />
a) +HO<br />
Pp. ⎯ ⎯⎯→ + + −<br />
b)<br />
NH3<br />
c ) + ( H3O<br />
+ NO3<br />
) ...........<br />
X ⎯⎯⎯⎯⎯→<br />
a) [Cu(OH2)4] 2 + 2HO [Cu(OH)2(OH2)2](s) + 2H2O<br />
b) Cu(OH)2(OH2)2(s) + 2H2O [Cu(OH2)4] 2 + 2HO<br />
[Cu(OH2)4] 2 + 4NH3 [Cu(NH3)4] 2 +4H2O<br />
Cu(OH)2(OH2)2(s) + 4NH3 [Cu(NH3)4] 2 + 2HO + 2H2O<br />
c) [Cu(NH3)4] 2 + 4H2O [Cu(OH2)4] 2 + 4NH3<br />
4NH3 + 4H3O 4NH4 + 4H2O<br />
[Cu(NH3)4] 2 + 4H3O [Cu(OH2)4] 2 + 4NH4<br />
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