. Balance the chemical equation for the following redox reaction under acidic aq

Question

. Balance the chemical equation for the following redox reaction under acidic aqueous conditions with the smallest whole-number coefficients possible using the half-reaction method. What is the coefficient of Cl? Cl2(g) + 5,032(aq) Cl(aq) + SO42-(aq) 3. Using the following data, determine the standard cell potential for the electrochemical cell constructed based on the following unbalanced reaction expression: 2Cu2+(aq) + Pb(s) 2Cu+(aq) +Pb2+(aq) Half-reaction Standard reduction potential Cu2+(aq) +e- Cu+(aq) Pb"(aq) + 2 e- Pb(s) +0.153 -0.126 7358 ecourses pvamu.edu/mod/quiz/review.php?attempt-73

Explanation / Answer

Ans 1 :

Start balancing the reactions , by writing oxidation and reduction half reactions seperately.

Now balance all the atoms except hydrogen and oxygen.

Now balance oxygen by adding water molecules and hydrogen by adding protons.

Now balance the charges by adding electrons and make electron gain = electron lost.

Now add the two half reactions together and simplify to get the final balanced reaction as :

S2O32- + 4Cl2 + 5H2O = 2SO42- + 8Cl- + 10H+

The coefficient of Cl- is 8.

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