"Curd" from the "Chemistry of drinks" set
Channel: MEL Chemistry
Date: 28/04/2018

Perform this amazing experiment at home with MEL Science: https://melscience.com/en/experiments/make-cottage-cheese-from-milk/

Safety
* Put on protective gloves and eyewear.
* Conduct the experiment on the plastic tray.
* Remove protective gloves before lighting the candles.
* Keep a bowl of water nearby when working with fire.

Disposal
* Dispose of solid waste together with household garbage.
* Pour solutions down the sink. Wash with an excess of water.

Step-by-step instructions
1. Milk consists of water with tiny drops of fat and protein clots that are both suspended in it. As long as the protein clots are small enough, they can float freely. However, they can be coagulated, for example, by adding calcium chloride CaCl₂.
2. The reaction of calcium chloride and milk proteins speeds up when heated.
3. The resulting clots are so large that they cannot pass through the filter paper. Cloudy milk whey passes through the filter, and what is left in the filter is called curd.