table ii solvent ( salt solutions in plateau height plateau volume 0- 001 m concentration ) ( ph ) seconds ( pv ) milliliters water -1.13 1.25 sodium chloride solution -1.13 1.37 sodium bromide solution -1.10 1.37 potassium chloride solution -1.08 1.37 sodium sulphate solution -0.72 1.59 calcium chloride solution -0.96 1.59 magnesium chloride solution -0.85 1.59 calcium sulphate solution -0.61 1.72 sodium phosphate solution -0.32 1.97 ferric chloride solution -0.29 1.99 time of solution and mixtures of ions - experiments currently in progress in these laboratories are concerned with the extremely important question of the variation of these endo-chronic properties of thiotimoline in the presence of mixtures of ions .