2 I I I 5 IO 14 PH Figure 1. phosphate in aqueous solution of ionic strength 1.0, at 39”. pH-rate profile for the hydrolysis of 2,4-dinitrophenyl ... (4) G. DiSabato and WP Jencks, J . Am. Chem. Soc., 83,4400 (1961). (5) A. Marcus and WB Elliott, ibid., 80, 4287 (1958). (6) The plot of log khyd against pK, of the leaving group for the dianions of acyl and monoaryl phosphates has a slope of 1.2 at 39”. The slope of the corresponding plot for the monoanions of a ...