Again, I agree with Rolf. An acid works by dissassociating water and causing it to form hydronium ions, H30. So you need the water! The strength of an acid is the chemical power it has to cause the hydronium ion formation - not simply the concentration. While increasing concentration of some acids, nitric, hydrochloric and sulfuric, will increase the chemical activity of the mixture, other acids are too weak to make good use of the increased concentration. Acetic is one such acid.
Berst Regards,
John Cholin