Answer:
K₂EDTA
Explanation:
The additive in the lavender tube is potassium dihydrogen ethylenediaminetetraacetate (K₂EDTA).
EDTA is a powerful chelating agent, that is, it binds strongly to metal cations.
Its main function in hematology labs is to prevent the blood from clotting by binding the Ca²⁺ ions.
