On the basis of the model of the water molecule derived from spectral and x-ray data and a proposed internal structure for water, the following properties of water and ionic solutions have been deduced quantitatively in good agreement with experiment. (1) The crystal structure of ice. (2) The x-ray diffraction curve for water. (3) The total energy of water and ice. (4) The degree of hydration of positive and negative ions in water. (5) The heat of solutions of ions. (6) The mobility of hydrogen and hydroxyl ions in water. And the following inferred in a qualitative way. (7) The density and density changes of water. (8) The explanation of the unique position of water among molecular liquids. (9) The dielectric properties of water and ice. (10) The viscosities of dilute ionic solutions. (11) The viscosities of concentrated acids.