A COMPUTER-PROGRAM RELATING SOLUTE POTENTIAL TO SOLUTION COMPOSITION FOR 5 SOLUTES

Data required to prepare solutions with desired solute potentials at a ny temperature from 0 to 40 degrees C are scattered, often have inappr opriate units, and usually require involved calculation or are not ava ilable. We wished to prepare a program so that anyone could obtain per tinent information simply. Adequate published data could be found only for mannitol, PEG 8000, NaCl, KCl, and sucrose, with water displaceme nt by mannitol and PEG 8000 having to be measured. The program sends t abular output to the screen and it may be written in a disk file, maki ng observation of relationships and preparation of graphical represent ation simple. A sequence of data may be generated over temperature, co ncentration, or potential ranges by specifying an initial value, inter val size, and number of intervals. Values are given for temperature, w ater density, molal and molar concentrations, g solute g(-1) water osm otic coefficient, g and mL water displaced g(-1) solute, solute potent ial (MPa), and g solute and g water needed for a requested volume of s olution.