Mixing small volumes
Add the liquids to be mixed to the test tube. Be sure the
mouth of the test tube is pointed away from you and other people.
While holding the test tube near its mouth, strike it near the
bottom with your index finger until the liquids have been thoroughly
Alternately, a glass rod may be used to mix liquids in a test
tube. Mix by moving the glass rod in an up-and-down, butter churn
motion. Be careful not to break through the bottom of the test