Curds And Whey Kitchen Science Experiment
Have you ever heard they phrase “curds and whey” in a nursery rhyme and wonder what it means? In this fun and easy experiment, we are going to head to the kitchen to use science to make some curds and whey.
- Wide mouthed jar
- One cup of milk
- One third cup of vinegar
- Measuring cups
- Measure out 1 cup of milk.
- Pour the milk into the jar.
- Now measure out 1/3 cup of vinegar.
- Add this to the jar of milk and observe. The milk will change. The curds will be on the bottom of the jar and the watery liquid at the top will be the whey.
How it Works:
There is a protein in milk called casein. The protein casein is negatively charged. Vinegar contains hydrogen ions which are positively charged. The negatively charged casein and positively charged hydrogen ions are attracted to one another and once they come together they form the white chunks called curds. This process is known as curdling.
Make This A Science Project:
Try milk with different percentages of fat. Try buttermilk. Test citric acid, lime juice, or lemon juice as a replacement for vinegar.