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.
The pH scale is made up of numbers from 0 through 14 and is used to determine whether a solution is an acid or a base. Numbers lower than 7 indicate acidity and numbers higher than 7 indicate alkalinity and indicate a base solution. A solution with a pH of 7 is neutral, a condition that is also known as pH balanced..