Balancing redox equations, Chemistry

Assignment Help:

Q. How to balance a redox equation?

Ans.

Redox equations may be written and balanced by the ionic half-reaction method. Let's use the half-reaction method to balance the following equation:

Ag+ + Zn -> Ag + Zn2+

1. Separate ionic half-reactions are written for the reduction half-reaction and for the oxidation half-reaction.

Ag+ + e- -> Ag (reduction)

Zn -> Zn2+ + 2e- (oxidation)

2. Multiply each half-reaction by a number such that the number of electrons gained in one half-reaction is equal to that lost in the other.

In the example, this is done by multiplying the Ag half-reaction by 2:

2Ag+ + 2e- -> 2Ag

There are now two moles of electron gained in the reduction half-reaction, and two moles of electrons gained in the oxidation half-reaction. Therefore, the electron gain and loss are now balanced.

3. The half-reactions are now added:

2Ag+ + 2e- -> 2Ag

+ Zn -> Zn2+ + 2e-

2Ag+ + Zn -> 2Ag + Zn2+

Note, that when adding the half reactions, there are 2e- on the left side of the equation and 2e- on the right side of the equation. Therefore, the electrons cancel each other out and do not appear in the net reaction equation.

Double check to see if you balanced the reaction correctly. Notice that there is a total charge of +2 on both sides. Notice that the number of atoms on each side of the equation is also balanced.


Related Discussions:- Balancing redox equations

Elements, list the elements that have all 3 properties: lustre , malleabbil...

list the elements that have all 3 properties: lustre , malleabbility and conductivity

Effect of concentration, Q. Show the Effect of concentration on Chemical Eq...

Q. Show the Effect of concentration on Chemical Equilibrium? Ans. When more of one of the chemicals is added to the reaction, more collisions take place moving the reactio

The metal ion will have highest number of unpaired electron, Which of the m...

Which of the metal ion will have highest number of unpaired electrons: (1) Cu +                  (2)  Fe +       (3) Fe 3+                             (4) Co 2+ A

Chain lengthening of aldoses or killiani-fischer synthesis, Chain Lengtheni...

Chain Lengthening of Aldoses (Killiani-Fischer synthesis) The conversion of an aldose to the next higher member includes the subsequent steps : (a) Creation of a cyanohydrin

Shahid Abbas, diagonal relationship and anomalous behaviour of the each ele...

diagonal relationship and anomalous behaviour of the each element of the periodic table

Chemical properties of cycloalkanes, Chemical properties of Cycloalkanes ...

Chemical properties of Cycloalkanes Cycloalkanes behave both such as alkenes and alkanes in their chemical properties. All cycloalkanes go through substitution reaction with ha

Explain bulking of sand, Explain Bulking of sand The presence of moistu...

Explain Bulking of sand The presence of moisture content to particular extent in sand increases the volume of sand. This is due to the fact that the moisture causes ?lm of wate

Why can butyllithium not be used for deprotonation, Why can butyllithium (B...

Why can butyllithium (BuLi) not be used for deprotonation? The direct alkylation of enolates is often not very efficient for a preparative synthesis due to problems with furthe

Thermodynamics of reduction process, Q. Thermo d ynamics of Re d uction Pro...

Q. Thermo d ynamics of Re d uction Process? As you have read above, metallurgy of most metals involves reduction of their oxides. The nature of the reduction process depends up

Dipole moment, why dipole moment of CH3CL is more than CH3F

why dipole moment of CH3CL is more than CH3F

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd