please do #87&89 Balance the following half-reactions: (acidic) Cr_2 O_7^2- (aq)

Question

please do #87&89

Balance the following half-reactions: (acidic) Cr_2 O_7^2- (aq) rightarrow Cr^3+ (aq) (basic) CrO_4^2- (aq) rightarrow Cr(OH)_4^- (aq) (basic) Bi^3+ (aq) rightarrow BiO_3^- (aq) (basic) CIO^- (aq) rightarrow Cl^- (aq) Balance the following half-reactions: (acidic) VO^2+ (aq) rightarrow V^3+ (aq) (basic) Ni(OH)_2 (s) rightarrow Ni_2 O_3 (s) (acidic) NO_3^- (aq) rightarrow NO_2 (aq) (basic) Br_2 (aq) rightarrow BrO_3^- (aq) Write balanced net ionic equations for the following reactions in basic solution: MnO_4^- (aq) + IO_3^- (aq) rightarrow MnO_2 (s) + IO_4^- (aq) Cu(OH)_2 (s) + N_2 H_4 (aq) rightarrow Cu(s) + N_2 (g) Fe(OH)_2 (s) + CrO_2^2- (aq) rightarrow Fe(OH)_3 (s) + Cr(OH)_4^- (aq) H_2 O_2 (aq) + ClO_4^- (aq) rightarrow CIO_2^- (aq) + O_2 (g) Write balanced net ionic equations for the following reactions in basic solution: S_2 O_3^2- (aq) + I_2 (aq) rightarrow S_4 O_6^2- (aq) + I^- (aq) Mn^2+ (aq) + H_2 O_2 (aq) rightarrow MnO_2 (s) + H_2 O(l) Zn(s) + NO

Explanation / Answer

4.87 )

a )

VO+2 (aq) + 2H+ (aq) + e- --------------> V+3 (aq)+ 3H2O (l)

b)

2 Ni(OH)2 (s) + 2OH- (aq) --------------> Ni2O3 (s) + 3H2O (l)+ 2e-

c)

NO3- (aq) + 2H+ (aq) + e - ----------------> NO2(aq) + H2O (l)

d)

Br2 (aq) + 12OH- (aq) -------------------> 2BrO3-(aq) + 6H2O (l) + 10 e-

4.89)

a) 2 S2O32- (aq) + I2 (aq) --------------------> S4O62-(aq) + 2 I- (aq)

( b)  Mn2+ (aq) + H2O2(aq) + 2 OH- (aq) ------------>MnO2 (s)+ 2 H2O (l)

(c) 4Zn(s) + NO3- (aq.) + 7H2O + 7OH- ----------------> NH4OH (aq.) + 4 Zn (OH)4 2- (aq)

d) 2 Bi(OH)3(s) + 3Sn(OH)3- (aq.) + 3OH- (aq.)   ------------------> 2Bi (s)+ 6OH-(aq.) + 3Sn(OH)6-2(aq.)

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