balancing REDOX reactions

REDOX reaction

electron transfer from one to another

Predict Spontaneity step one - materials

list materials present

• weak acids stay as molecules

• ionic compounds disociate

• aqueous solutions have H₂O(l)

• strong acids have H⁺

Predict Spontaneity step two - OA and RA

identify oxidation agents and reduction agents

Predict Spontaneity step three - SOA and SRA

• use redox table to find the SOA and SRA

• SOA: top left, reduction half reaction

• SRA: bottom right, oxidation half reaction

Predict Spontaneity step four - balance half reaction

• balance half reaction based on electron transfer

• multiply one or both reaction with whole number coefficient

Predict Spontaneity step five - net ionic equation

• write net ionic equation

• use spontanrity rule to see if it reacts or not

oxidation number method step one - oxidation numbers

write oxidation numbers

oxidation number method step two - change in oxidation number

connect the atoms changing in oxidation number

oxidation number method step three - subscripts

identify oxidized and reduced and balance based on subscripts

oxidation number method step four - oxidation and reduction

use coefficients to make the increase in oxidation = reduction

oxidation number method step five - oxygen/hydrogen

balance oxygen and hydrogen with H₂O and H⁺

oxidation number method step six - check

check balancing for mass and charge