HNO 3 is a strong acid and for all practical purposes dissociates completely. A weak acid is an acid that does not dissociate completely solution. The equilibrium constant for a weak acid is called the dissociation constant or ionization constant, K a . We neglected the self-dissociation of water. Any conjugate base of a weak acid is itself a weak base.
Some salts when added to water make the solution acidic or basic.
Predict the effect of the anion on the pH of water. Determine the overall effect. Adding NH 4 Cl to water. Adding sodium acetate to water. Adding NH 4 F to water.