As a model of the new system a prototype allows for several forms of communication. First, it allows the developers to communicate to the users their understanding of the requirements. (Obviously before a prototype can be built there must be some initial requirements discussions between developers and users).
(Arrhenius) a substance that yeilds hydroxide ions in an aqueous solution; metallic oxides in water. Buffers. substances that in solution are capable of neutralizing, within limits both acids and bases, and thereby maintaining the original or constant pH of the solution; substances that prevent changes in pH. Ex. borax, sodium phosphates, and citrates. Crystallization. the process by which a substance is given definite form.
Basics Of pH Control. FUNDAMENTAL CONSIDERATIONS. By definition, pH is the negative logarithm of the. hydrogen-ion concentration in aqueous solution. This. means that a solution having a pH value of 4 has ten. times more hydrogen ions than a solution whose pH is. 5. For control systems neutralizing spent acids or. bases, pH value per se is of little consequence except.