Life giving formula!

Electroplating in Copper Sulphate Solution

Yeah I know. You must be thinking I am crazy! But read on and you will find out what I mean. It is funny that I don’t exactly remember in which standard this story took place. It is probably 9th or 10th. I went to my friend Shyamlal’s house with my brother to work on our electroplating project. (There are actually multiple stories centered  electroplating which I plan to include in a different post.)

Molecular Structure of Sulfuric Acid

After working on the plating stuff for a while, we got bored and wanted to try something different. We took a wide plastic lid of a jar and added copper sulfate solution to it. I don’t remember what the second ingredient was. It was something of green color. To this green solution, we added a little sulfuric acid. Since we didn’t have a stirrer, we used a paint brush to stir the solution. This caused some of the bristles to come out of the brush and fall into the solution.

Brush Bristles – Ours were thinner than this though

We kept the solution for sometime and went to the terrace to play. Later on we came back inside and looked closely at the solution. To our horror, we found that the bristles were moving very slowly even though the solution was static. The motion was random, something that resembled the motion of a worm. We thought, “Oh my, this formula gave life to bristles.

We stirred the solution again and let it settle down to see whether this conclusion was true and it was. Once settled, the bristles started moving like worms again.

Brownian Motion – A visualization

I wrote down the formula and took it home. For many days I was thinking what the hell happened to the bristles that resulted in this random motion that created the illusion of life.

After a while it clicked: “Brownian Motion!” It was the same stuff that led Einstein in 1905 into thinking that Boltzmann’s conclusions on atoms were in fact true. What he observed was the movement of pollen grains in water. We observed the same effect with brush bristles in a denser solution.

The puzzle was finally solved. Even though we didn’t invent a formula that gives life, it was enough to cause me headache for many days trying to figure out the meaning of that experiment!