Percent Solids Determination and Homemade Weighing Cups

Video Below:
Determining the percent solids in either a water based or organic solvent based material is a basic procedure used to make calculations for reactions, and in some cases, just curiosity. But, in the world of chemistry, it is a fundamental process. Although I used Elmer's glue as an example, all solutions and emulsions with solid constituents are applicable. The video is really self explanatory but here is the breakdown of the method:

1. Weigh the aluminum cup. Label this A
   
2. Without taring, add the wet sample. Label this B
   
3. Let the sample evaporate or warm slowly to drive off the water or solvent. Label this C
   
4. Weigh the now dry sample and the cup.
   

Now, use this simple formula to calculate the solid content:
C - A
B - A
Do the subtraction and divide the result and multiply by 100. You now have the amount of solid chemical in the cup in percent.  Enjoy!

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