7.) When the following equation is balanced properly under basic conditions, wha

Question

7.) When the following equation is balanced properly under basic conditions, what are the coefficients of the species shown?

S2- + Ag2O = S + Ag

Water appears in the balanced equation as a (reactant, product, neither)____________? with a coefficient of__________? (Enter 0 for neither.)

How many electrons are transferred in this reaction_____?

8.) When the following equation is balanced properly under basic conditions, what are the coefficients of the species shown?

NO2- + HXeO4- = NO3- + Xe

Water appears in the balanced equation as a (reactant, product, neither)____________? with a coefficient of__________? (Enter 0 for neither.)

How many electrons are transferred in this reaction_____?

9.) When the following equation is balanced properly under basic conditions, what are the coefficients of the species shown?

I2 + Br- = I- + Br2

Water appears in the balanced equation as a (reactant, product, neither)____________? with a coefficient of__________? (Enter 0 for neither.)

How many electrons are transferred in this reaction_____?

Explanation / Answer

7.

S2- + Ag2O = S + Ag

(i) Separate oxidation and reduction half reactions

Oxidation Half Reaction     Reduction Half Reaction

S2- ---------> S                           Ag2O -------------> Ag

(ii)

Balance all atoms other than O and H

S2- ---------> S                           Ag2O -------------> 2Ag

(iii)

TO balance O in basic medium add OH- ions.

S2- ---------> S                           Ag2O -------------> 2Ag + OH-

(iv)

To balance H in basic medium add H2O molecules.

S2- ---------> S                           Ag2O + H2O-------------> 2Ag + OH-

(v)

Repreat (iii) and (iv) till all H and O gets balanced.

S2- ---------> S                           Ag2O + H2O-------------> 2Ag + 2 OH-

(vi)

To balance charge add electrons at more positive charge side.

S2- ---------> S + 2 e                           Ag2O + H2O + 2 e ------------> 2Ag + 2 OH-

(vii)

To eualise electrons in both half reactions ,

do OHR * 1 and RHR * 1

S2- ---------> S + 2 e                           Ag2O + H2O + 2 e ------------> 2Ag + 2 OH-

(viii)

Add both half reactions to get final balanced redox reaction.

S2- + Ag2O + H2O ----------> S + 2Ag + 2 OH-

SO,

Water appears as REACTANT with 1 coefficient.

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