Hamed’s rule

The standard deviations of the fit shown in Table I, as well as the smooth plot of an as a function of m in Figure 1, were used as criteria for testing the validity of Harned s Rule. Hamed s Rule is a good description of the data for m = 0.05, 0.1, 0.25, 0.5, and perhaps (as a borderline case, based on the value of ai2) at m = 1.0 mol kg-1. The nonlinear form of Equation 6 was used at m = 1.0 and 1.5 mol kg"1, where the greatest deviations from linearity were thought to occur. 

Pytkovicz, R. M. and Kester, D. R. Hamed s rule behavior of NaCl-Na2S04 solutions explained by an ion association model. Amer. J. Sci. 267, 217-229 (1969). 

Figure 2 makes it clear that —log y falls slowly as hydrochloric acid replaces a part of the sodium chloride in seawater I. The linear variation is in accord with Hamed s rule, and the magnitude of the drop is a measure of —log ynci referred to the new standard state. The behavioral similarity between seawater I and 0.66M sodium chloride is illustrated by the fact that the values of log ynci for these two solvents at Hci = 0.06 mole/kg are —0.001 and —0.002, respectively. 

Al-Shaer, E.S., Hamed, H.H. Firewall Policy Advisor for anomaly discovery and rule editing. In Marshall, A., Agoulmine, N. (eds.) MMNS 2003. LNCS, vol. 2839,... 

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