It's supposed to replace bicarbonate that is lost. Your cat isn't losing anything. She's retaining everything. I'm afraid the acid she has is from toxins and that the baking soda might make it worse.
I'm going to take a better look now at the link you provided.
If it were as simple as baking soda your cat would be well now. A $500 drug didn't work. They ran all the tests. The bottom line is that nothing short of dialysis can save her.
I know it's difficult to accept that she is in her final hours, but she is. Try to make sure she isn't suffering.
I know this is incredibly painful. I feel for you.
I know I just have a severe distrust in doctors in general. I myself have been made sicker by them only to cure myself simply with a radical diet. I know this is different, I wasn't dying like this but still. Anyway, thanks. I will just let her be in peace I think that is the best thing probably.
Just read about your story, @jwark .. You have all my hopes and prayers for you and your kitty to overcome this.. She is under your love and care and I'm sure she feels reassured that you're doing everything you can to save her.
@jwark:
Hugs from every inch of my heart. I've been through acidosis with family members and it's agonizing. Please do not let her suffer much. My heart is totally breaking for you right now.