Neutralizing concrete floor after cleaning cream with muriatic acid
I have rinsed with clear water and a large rubber squeegee 3 times. On the inside basements I cleaned I made a u shaped dam slightly wider than my squeegee, I set my shop vac to suck the water as I pushed it in, it really worked better than I thought it would, I used some scrap angle iron but I bet some 2x4 scraps would work. 
On the basement I may have rinsed it 4 times. 
But on all the garages I spray &amp; squeegee 3 times. This probably depends on the strength you used. I usually use ~15% depending on how bad the floor is. Baking soda will neutralize the acid but still need to rinsed. The reaction actually dose change the ph but not totally, I started using 3 rinse cycles after working with acid processing equipment (3 rinses is what they required).