# How do acid base reactions differ from redox reactions?

Aug 14, 2017

Redox reactions are conceived to result from electron transfer between reagents.....

#### Explanation:

Redox reactions are conceived to result from electron transfer between reagents, and a FORMAL change in oxidation number.

On the other hand, acid-base reactions may not necessarily involve a change in formal oxidation state.

For the general acid base reaction in water.....

H^+ + ""^(-)OH rightleftharpoonsH_2O,

...of course, electrons couple to form the new $H - O$ bond, but the oxidation numer of $O$ $\left(- I I\right)$, and $H$ $\left(+ I\right)$ is constant in reactants and products.

On the other hand we could conceive of some acid-base reactions that are formal redox reactions, e.g.

$L i H \left(s\right) + {H}_{2} O \rightarrow L i O H \left(a q\right) + \frac{1}{2} {H}_{2} \left(g\right) \uparrow$

This is a formal comproportionation reaction; hydride anion is oxidized, and protium ion (in water) is reduced to give zerovalent dihydrogen gas.