Write the half-balanced equations and the balanced equation for each of the foll
ID: 902673 • Letter: W
Question
Write the half-balanced equations and the balanced equation for each of the following reactions in acidic media. Fe^2+ +Cr2O7^4/2- ----->Fe^3+ + Cr^3+ . N2H4 reacts with the bromate ion to produce nitrogen gas and the bromide ion. The permanganate ion reacts with diarsenic trioxide to produce the manganese (II) and arsenate ions. MnO4^- + ClO^- -------> Mn^2+ +ClO2^- . IO4^- + Fe^2+ -------> IO2^- + Fe^3+ .
Explanation / Answer
Write the half-balanced equations and the balanced equation for each of the following reactions in acidic media:
Fe^2+ + Cr2O7^2- ----->Fe^3+ + Cr^3+ .
6e^- + 14 H^+ + Cr2O7^2- ----> 2Cr^3+ + 7H2O
(Fe^2+ ------> Fe^3+ + 1e- ) x 6
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6 Fe^2+ + 14 H^+ + Cr2O7^2- -----> 2Cr^3+ + 7H2O + 6 Fe^3+
N2H4 reacts with the bromate ion to produce nitrogen gas and the bromide ion.
N2H4 + BrO3^- ----> N2 + Br-
(6e- + 6H^+ + BrO3^- ------> Br- + 3H2O) x 4
(N2H4 ------> N2 + 4H^+ 4e-) x 6
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4 BrO3^- + 6 N2H4 -----> 4 Br- + 12 H2O + 6N2
The permanganate ion reacts with diarsenic trioxide to produce the manganese (II) and arsenate ions.
MnO4^- + As2O3 ----> Mn^+2 + AsO4^+3
5e- + 8H^+ + MnO4^- ----> Mn^+2 + 4H2O
H2O + As2O3 -----> AsO4^+3 + 2H^+ + 5e-
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H2O + As2O3 + 6H^+ + MnO4^- ----> Mn^+2 + 3H2O + AsO4^+3
MnO4^- + ClO^- -------> Mn^2+ +ClO2^-
(5e- + 8H^+ + MnO4^- ----> Mn^+2 + 4H2O) x 2
(H2O + ClO^- -----> ClO2^- + 2H^+ + 2e-) x 5
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6H^+ + 2 MnO4^- + 5 ClO^- ----->2 Mn^+2 + 3 H2O + 5 ClO2^-
IO4^- + Fe^2+ -------> IO2^- + Fe^3+ .
4e- + 4H^+ + IO4^- -----> IO2^- + 2H2O
(4H^+ + IO4^- ------> Fe^3+ + 1e- ) x 4
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4H^+ + IO4^- + 16H^+ + 4 IO4^- ----> IO2^- + 2H2O + 4Fe^3+
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