FIG. 2. Influence of hydrogen ion concentration on initial rate of diffusion Of liquid from a solution of HNO8 through a gelatin-coated collodion membrane into a M/128 solution of cane sugar , M/256 NaC1, CaC12, CeC13, or Na~so4 of the same hydrogen ion concentration. Abscissae are the pH; ordinates, rise of level of liquid in manometer connected with the salt solution, after 1 hour. Water negatively charged.