Experimental investigation on moving chemical reaction boundary theory forweak-acid-strong-base system with background electrolyte KCl in large concentration

In this report, the moving chemical reaction boundary (MCRB) was formed wit h the weak acid of acetic acid (HAc) and the strong alkali of NaOH, coupled with the excess of background electrolyte KCl. The experiments were compar ed with the predictions by the moving chemical reaction boundary equation ( MCRBE). It is very interesting that (1) the experimental results are in goo d agreement with the predictions with the original MCRBE if the MCRB is an anodic moving boundary, (2) however, the experiments are extremely far away from the predictions with the original MCRBE if a cathodic moving boundary . Hence, the original MCRBE must be corrected under the later situation of cathodic moving,MCRB. The corrected MCRBE was well quantitatively proved to be valid for the cathodic moving MNRB formed with the same electrolytes of HAc, NaOH and KCI. (C) 2001 Elsevier Science B.V. All rights reserved.