The distribution coefficient, also known as log D, is a scientific measurement that determines the degree of solubility of a compound. The distribution coefficient quantifies the ratio of the amount of a compound present in two distinct phases; one is predominantly aqueous. It considers the combined concentration of all forms of the compound, including ionized and non-ionized. The pH of the aqueous phase plays a vital role in determining the log D value. In non-ionizable compounds, the log D value is equal to the log P regardless of pH. The measurement of log D value requires the pH of the aqueous phase to be adjusted to a specific value that remains stable during the entire experiment. The calculation of the log D value is the negative logarithm of the ratio between the total concentrations of the compound's different forms in the two solvents. In other words, the log D value helps understand how a molecule of interest interacts with solvents at varying pH conditions.What is the D molecule's logarithm in the negative form?