Cola with milk

Hello, dear friend!

You have a gift from the program "Chemists home alone"! You will have to experiment with the cola you made on the program and the milk.

Safety precautions:

  • (Read this text with an adult from your home)

    Everything that is used during this experiment is safe, but you should not taste any of it.

    If you get any solution on you, it's okay, it's enough to wash off the solution with running water.

    If cola solution gets in your eyes, it may pinch, immediately rinse your eyes with water!

    You can dispose of the results of your experiments together with the rest of household waste.

In your set:

  1. Citric acid container
  2. Milk powder container
  3. Empty container
  4. Paper filter
  5. Wooden spatula
  6. Pasteur pipette

For the experiment, you will need the "COLA WITH OWL", which you made in the laboratory of spilled soda (any other soda you will find at home is also OK).


Open the container labeled "MILK", it contains milk powder (milk from which all the water has been removed). Add warm water to the container up to the 50 ml mark (this is about 5/6 of the container).
Stir the mixture thoroughly with a wooden spatula so that no lumps remain. By adding water to milk powder, we made reconstituted milk.
Take the "Cola with an Owl" that you made in the Spilled Soda Lab. Open the container labeled "CITRIC ACID". Pour the citric acid with cola up to the 40 ml mark. Stir the solution thoroughly with a spatula (use the clean side) until the citric acid is completely dissolved in the cola.
Using a pipette, add 2 ml of milk to the cola. To do this, squeeze the pipette, dip the tip of the pipette into the milk, release the pipette so that the milk is collected into the pipette; in order to drain milk from the pipette, you need to squeeze the pipette.
Leave the jar for about 20-30 minutes (more is ok). This is necessary so that the milk curdles and the liquid separates into 2 parts - cloudy and transparent.
Roll up the filter paper as shown and place it on the neck of the empty container. Make sure the filter does not fall into the container.
Carefully pour a little of the resulting solution on the filter and wait until all the liquid is filtered and gets into the container.
The filtered cola should be transparent and almost colorless, but at the same time retain the smell.

What happened?

  • 1
    Most of the household chemicals are solutions consisting of several components.
  • 2
    And often these components can not only be mixed, but also separated, in this case, we separated the dye with the help of changes that occurred in the milk protein molecules.
  • 3
    The real cola, among other things, contains a certain amount of orthophosphoric acid. We added citric acid to ours.
  • 4
    Under its action, the molecules of milk proteins changed (curded) and began to bond with each other, with drops of fat and dye molecules. In fact, what is left on the filter is colored cottage cheese (by the way, it is often obtained in this way in the industry).
  • 5
    The remaining components of the cola were not bound and passed freely through the filter. As a result, we got a clear solution that smells like cola.

Questions and answers

Theoretically, yes. But in any case, we do not recommend doing this, because it is sour and not tasty at all.

Next science workshop in Barcelona

May 13, Saturday
scientific workshop for children 5-6, 7-10 and 11-13 years
We will understand the chemical and physical properties of food, create gummy bears, assemble our own devices for extracting odors, figure it out in food additives and create them in the laboratory, study the physical and chemical properties of familiar products, and even prepare rations for astronauts. Science has never tasted so good!
None of our programs are repeated. The schedule of the nearest programs you can see on the page Calendar ↗. And on the page about us ↗ you can see which programs we have already run.
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