BIOTEST

MATERIAL:
-Nanoparticules of gold
-Watch glasses
-Distilled water
-Water with sugar
-NaCl

PROCEDURE:
Firtst we need to know that the nanoparticules of gold change their color when we cahnge the agregation.
We have tree watch glasses
-In the firs watch glasses we put distilled water and gold. But we can't see any reaction.
-In the second watch glasses we put water with sugar and gold. But we can't see any reaction.
-In the third watch glasses we put NaCl and gold. In this reaction the nanoparticules change the color(blue)











Nanoparticules of gold

QUESTION:
Why change the color when we add NaCl?
Because the agregation of nanoparticules change.