Final answer:
The mounting medium typically used for hematology slides is Canada balsam because it preserves the specimen integrity and provides clear viewing.
Step-by-step explanation:
The mounting medium used to cover slip hematology slides is Canada balsam. This substance is ideal because it has a refractive index similar to that of glass, which provides optical clarity when viewing samples under the microscope. This medium preserves the specimens and prevents drying out, shrinking, or swelling, maintaining the integrity of the hematology slides for a long time. Unlike distilled water or acetic acid, which can evaporate or alter the specimen, and glycerol, which is not commonly used in hematology, Canada balsam is a natural resin dissolved in xylene, and once hardened, it secures the cover slip in place permanently.