Perhaps so, after dilution.
This is interesting:
http://en.wikipedia.org/wiki/Sulfuric_acid#Sulfur-iodine_cycle
Maybe a combined approach of bombarding Venus with calcium rich asteroids and acid reducing bacteria.
Another possibility would be if we could find alkaline deposits on Venus and get those into the air.
90% of the surface of Venus is basalt. I see mention of alkali basalt, but don't know what the PH normally is or what it's likely to be on Venus. However I see basalt tends to weather quickly, so water might just do the trick.
Water could disolve compounds in the basalt and if those compounds are alkaline enough, they could neutralize the acid. Once the acid is neutralized, we could introduce plant forms that could withstand the heat and trap the carbon while releasing oxygen into the air.
Supposedly Venus's atmosphere is 90 times more dense than ours. I wonder what the introduction of that much water would have on it's atmosphere.