In acidic solution, the sulfate ion can be used to react with a number of metal

Question

In acidic solution, the sulfate ion can be used to react with a number of metal ions. One such reaction is

SO42(aq)+Sn2+(aq)H2SO3(aq)+Sn4+(aq)

Since this reaction takes place in acidic solution, H2O(l) and H+(aq) will be involved in the reaction. Places for these species are indicated by the blanks in the following restatement of the equation:

SO42(aq)+Sn2+(aq)+     H2SO3(aq)+Sn4+(aq)+     

What are the coefficients of the reactants and products in the balanced equation above? Remember to include H2O(l) and H+(aq) in the appropriate blanks. Your answer should have six terms.

Enter the equation coefficients in order separated by commas (e.g., 2,2,1,4,4,3). Include coefficients of 1, as required, for grading purposes.

Explanation / Answer

SO4{2-}(aq) + Sn{2+}(aq) + 4 H{+} = H2SO3(aq) + Sn{4+}(aq) + H2O

Reaction stoichiometry

Compound

Coefficient

Molar Mass

SO4{2-}(aq)

1

96.063697159819

Sn{2+}(aq)

1

118.70890284018

H{+}

4

1.0073914200905

H2SO3(aq)

1

82.07908

Sn{4+}(aq)

1

118.70780568036

H2O

1

18.01528

SO4 2- (aq)+ Sn 2+ (aq) --> H2SO3 (aq) + Sn 4+ (aq)

begin by separating into two pieces

So4 2- (aq) --> H2SO3 (aq)

then balance the S (which is already balanced)

after, balance the O by adding H2O where needed

SO4 2- (aq) --> H2SO3 (aq) + H2O (l)

now that the Oxygens are balanced, balance out the Hydrogens by adding H+ wherever needed.

4H+ (aq) + SO4 2- (aq) --> H2SO3 (aq) + H2O (l)


4e- + 4H+ (aq) + SO4 2- (aq) --> H2SO3 (aq) + H2O (l)


Sn 2+ (aq) --> Sn 4+ (aq)

all you need to do for this equation is add electrons to balance out the charge

Sn 2+ (aq) --> Sn 4+ (aq) + 2e-

now, if you multiply the second equation by 2 the electrons will end up cancelling out

4e- + 4H+ (aq) + SO4 2- (aq) --> H2SO3 (aq) + H2O (l)

+ 2Sn 2+ (aq) --> 2 Sn 4+ (aq) + 4 e-

if you add the two together then you get the balanced equation
4H+ (aq) + SO4 2- (aq) + 2Sn 2+ (aq) --> H2SO3 (aq) + 2Sn 4+ (aq) + H2O (l)

Reaction stoichiometry

Compound

Coefficient

Molar Mass

SO4{2-}(aq)

1

96.063697159819

Sn{2+}(aq)

1

118.70890284018

H{+}

4

1.0073914200905

H2SO3(aq)

1

82.07908

Sn{4+}(aq)

1

118.70780568036

H2O

1

18.01528

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