Balancing equations in basic medium Part 1 (a) MnO4^-( aq )+S^2( aq ) ----> MnS(

Question

Balancing equations in basic medium

Part 1

(a) MnO4^-(aq)+S^2(aq) ----> MnS(s)+S(s)

First,

MnO4^- --> Mn2+

balance O,

MnO4^- --> Mn2+ + 4H2O

add H+ and OH-,

MnO4^- + 4H2O --> Mn2+ + 8OH-

add electrons,

MnO4^- + 4H2O + 5e- --> Mn2+ + 8OH-

Second,

S^2- --> S

add electrons,

S^2- --> S + 2e-

multiply first with 2 and second with 5, add them together,

2MnO4^- + 8H2O + 10e- --> 2Mn2+ + 16OH-

5S^2- --> 5S + 10e-

------------------------------------------------------------------

2MnO4^-(aq) + 5S^2-(aq) + 8H2O(l) ---> 2Mn2+(aq) + 5S(s) + 16OH-(aq)

Is net balanced equation

Part 2   (1 point)

(b)MnO4(aq)+CN(aq) ---> CNO(aq)+MnO2(s)

first,

MnO4- --> MnO2

balance O,

MnO4- --> MnO2 + 2H2O

add H+ and OH-,

MnO4- + 2H2O --> MnO2 + 4OH-

add electrons.

MnO4- + 2H2O + 3e- --> MnO2 + 4OH-

second

CN- --> CNO-

balance O,

CN- + H2O --> CNO-

add H+ and OH-,

CN- + 2OH- --> CNO- + H2O

add electrons,

CN- + 2OH- --> CNO- + H2O + e-

multiply this with 3 and add both equations,

MnO4- + 2H2O + 3e- --> MnO2 + 4OH-

3CN- + 6OH- --> 3CNO- + 3H2O + 3e-

----------------------------------------------------------

MnO4-(aq) + 3CN-(aq) + 2OH-(aq) --> MnO2(s) + 3CNO-(aq) + H2O(l)

Is balanced equation,

Part 3   (1 point)

(c) MnO4(aq)+SO23(aq) ---> MnO2(s)+SO24(aq)

first,

MnO4- --> MnO2

balance O,

MnO4- --> MnO2 + 2H2O

add H+ and OH-,

MnO4- + 2H2O --> MnO2 + 4OH-

add electrons.

MnO4- + 2H2O + 3e- --> MnO2 + 4OH-

second,

SO2^3- ---> SO4^2-

balance O,

SO2^3- + H2O ---> SO4^2-

add H+ and OH-,

SO2^3- + 2OH- ---> SO4^2- + H2O

add electrons,

SO2^3- + 2OH- ---> SO4^2- + H2O + 5e-

multiply first with 5 and second with 3, add them together,

5MnO4- + 10H2O + 15e- --> 5MnO2 + 20OH-

3SO2^3- + 6OH- ---> 3SO4^2- + 3H2O + 15e-

-------------------------------------------------------------------

5MnO4-(aq) + 3SO2^3-(aq) + 7H2O(l) --> 5MnO2(s) + 3SO4^2-(aq) + 14OH-(aq)

Is balanced equation

Explanation / Answer

Permanganate ion (MnO4– ) is used in water purification to remove oxidizable substances. Complete and balance the following reactions for the removal of sulfide, cyanide, and sulfite. Assume that the result of the reaction is a basic solution. Please provide state of matter as well thank you.

Part 1   (1 point)

Part 2   (1 point)

Part 3   (1 point)

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