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If you'd like to carry out these experiments with your middle school students, request reagents here
VOCABULARY TO LEARN:
“tare” = to zero a balance, in other words to remove the weight of the container from the measurement
For experiments that need a stock of Vitamin A, you will have to snip the end of a capsule off, and squeeze the oily liquid into an eppendorf tube. There will likely be around 100 ul of solution that you can then pipet as needed. Be sure to label your eppendorf tube to note the contents of the tube and the date.