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PERCENT SOLUTIONS
NOTE:
This document was adapted from
http://www.uab.edu/clabsc/solution.htm
There are three types of percent solutions. All are parts of solute per 100 total
parts of solution.
Based on the following definitions you may calculate the concentration of a solution or calculate
how to make up a specific concentration.
1.
% W/W 
Percent of weight of solute in the total weight of the solution. Percent here is the
number of grams of solute in 100 grams of solution.
Example:
A 100% (W/W) NaCl solution is made by weighing 100 g NaCL and
dissolving it in water until the solution weighs 100 g.
2.
% W/V 
Percent of weight of solution in the total volume of solution. Percent here is the
number of grams of solute in 100 mL of solution (final volume). This is the least “logically pure”
way of naming a solution, but the most common way of doing so for biological research
laboratories. In fact, any percent solution not stipulated as W/W, W/V, or V/V is assumed to
be % W/V.
Example:
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This note was uploaded on 04/02/2010 for the course MIC 102L taught by Professor Igo/nelson during the Spring '09 term at UC Davis.
 Spring '09
 IGO/NELSON

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