Lab 3B

Separation of a Mixture by Paper Chromatography












                


                  




LAB TIME!!!

We spot the food colorings to the 22 cm strips. 

Then we put the strips into the test tube with 

water. The components would slowly travel up. At last,

 we can see different color components on 

the strip.

We did red, blue, and yellow food colorings in the class. Those are primary color components.Then we found out that green food coloring is mixed by blue and yellow components, the unknown mixture is mixed by blue, red, yellow components.By finding Rf values, we can figure out what a mixture is made up. 

             
Calculate Rf

measuring the distance the sample traveled, you should measure from the origin (where the middle of the spot originally was) and then to the center of the spot in its new location.

To calculate the R_f value, we use the equation:

Rf =	distance traveled by the sample component distance traveled by the solvent