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Example: make NaCl-water solution in wt% at 25C
In main menu Click  Popular services>Make solution, then choose wt% as concentration, use default temperature 25C at which solutionton is to make (figure 1). Then choose method to add solvent information from system (see figure 1) or add my solvent (see figure 2). For wt% unit, molecular weigt input is not required. Solvent (water) density is required. If user wants to calculate volume of solute, and final solution volume, NaCl density is required.  The system gives warning message if required information is missing.   

Figiure 1. Make NaCl-water solution, use system solvent.


Figiure 2. Make NaCl-water solution, add user's solvent.

After setting up solvent and solute, click make solution button to next step. The user can input target concentration 2% and solvent volume 1000 ml.  Then click calculate button to get solute mass, volume, solution volume.   The user may use 20.34796 g NaCl mass as input to calculate solute, solvent, and final solution volumes (see figure 4). The system uses ideal solution model to deal with final solution volume. The user may force NaCl volume contribution as zero by inputting 0 at solute volume (see figure 5). 

Figure 3. Add solvent volume to calculate all other infromations


Figure 4 Add solute mass to calculate rest information.


Figure 5. Run the solution calculator by approximating solute volume contribution zero.