In order to standardize the ${sigma}^*,;{ ho}^*$ is taken as unity for the benzoic acids by analogy with the fact that ${ ho}$ of benzoic acids in the ground state is taken as unity. The $pK_{alpha}^*$ of many benzoic acid derivatives are determined by UV spectroscopy and fluorescence spectral analysis whenever possible. The ${sigma}^*$ constants are derived from the Hammett equation utilizing these $pK_{alpha}^*$ values and the $pK_{alpha}^*$ of the benozic acid derivatives showed better correlationship with ${sigma}^*$ than ${sigma},;{sigma}^+;and;{sigma}^-$ as expected. From these ${sigma}^*$ values, ${ ho}^*$ of the phenol derivatives was calculated to be 1.28. The new standardized ${sigma}^*$ values are calculated from the $pK_{alpha}^*$ values of phenols since more accurate and abundant data are available for phenols than the benzoic acid derivatives.