Final answer:
The final pH of a solution when a weak acid and a weak base are combined is determined by the remaining hydronium or hydroxide ions in solution after the two have reacted.
Step-by-step explanation:
When a weak acid and a weak base are combined, the final pH of the solution will be determined by b. The remaining hydronium or hydroxide ions in solution. This is because the weak acid partially dissociates in water to produce hydronium ions while the weak base partially dissociates to produce hydroxide ions. The degree to which each reacts will depend on their respective dissociation constants and their concentrations. When they react, the hydronium and hydroxide ions combine to form water, thereby partially neutralizing each other. The extent of this reaction will influence the pH of the final solution, typically resulting in a pH that is neither strongly acidic nor strongly basic, but depending on which reactant is in excess.
An indicator's role is to show the end point of a titration and does not determine the pH of a solution. Similarly, the volume of water and the initial pH of the solution are not direct determinants of the final pH in this context.