confusion regarding carboxyl group dissociation on SOM and CEC

Fragment of a discussion from Course talk:APBI200

thanks! but where does the OH- in the first equation come from?

Katrine‎20:29, 10 March 2019

The OH- from the first equation comes from:

In soil, when compounds containing base forming cations (ie. fine minerals) meets water, they will hydrolyze:

Na2CO3 + H2O --> 2Na+ + HCO3- + OH-

The Na+ then binds to the soil cation exchange sites. OH- is what makes the soil alkaline. This OH- then reacts with the soil colloid functional group (R-COOH) to make R-COO- + H20 (first equation)

MelodyFu (talk)‎21:40, 10 March 2019
 
Retrieved from "https://wiki.ubc.ca/Thread:Course_talk:APBI200/confusion_regarding_carboxyl_group_dissociation_on_SOM_and_CEC/reply_(4)#confusion_regarding_carboxyl_group_dissociation_on_SOM_and_CEC_11222"