Home

Home
Common Compounds
Exam Guide
FAQ
Features
Glossary
Construction Kits
Companion Notes
Just Ask Antoine!
Simulations
Slide Index
Toolbox
Tutorial Index

FAQ
Introduction
Measurement
Matter
Atoms & ions
Compounds
Chemical change
The mole
Gases
Energy & change
The quantum theory
Electrons in atoms
The periodic table
Chemical bonds
Solids
Liquids
Solutions
Acids & bases
Redox reactions
Reaction rates
Organic chemistry
Everyday chemistry
Inorganic chemistry
Environmental chemistry
Laboratory
History of chemistry
Miscellaneous


Home :FAQ :SolutionsPrint | Comment
Previous Question Next Question

Can I get a solution density from the solute mass and solvent volume?

I am adding 50 gm of sugar to 500 ml of water. How do I calculate the density of the sugar solution? (Is it) 50 gm/500ml or 50/(volume of water displaced by the sugar)?
Jennifer Schmahl

The density of the solution will be mass of solution divided by volume of solution.
  • 50 g/500 mL isn't correct because the volume of the solution isn't 500 mL.
  • 50 g/(volume of water displaced by the sugar) isn't correct because you're comparing a sugar mass to a water volume.

To determine the solution's density, weigh a precisely measured volume of your solution, and divide the mass of solution by the volume of solution.

You must measure the volume of solution to obtain the density. You can't calculate the density of the solution with just the data you've given above. You can get a crude estimate (e. g., if you assume the volume of the dissolved sugar is negligible compared to the volume of the water, the density is roughly (50 g sugar + 500 g water) / 500 mL solution. But the assumption isn't correct- try it yourself!) Even if you happened to know what the volume of the added sugar was, the volume of a solution is NOT the volume of the solute plus the volume of the solvent.

Author: Fred Senese senese@antoine.frostburg.edu



General Chemistry Online! Can I get a solution density from the solute mass and solvent volume?

Copyright © 1997-2010 by Fred Senese
Comments & questions to fsenese@frostburg.edu
Last Revised 02/23/18.URL: http://antoine.frostburg.edu/chem/senese/101/solutions/faq/solution-density-from-concentration.shtml