In a sublimation apparatus, the water pressure in the connected aspirator should be ________. A water pressure that is too low would the system, slowing or stopping the sublimation. In general, variations in water pressure could also ___________.
A) The water should be well sealed by putting a water trap between the aspirator and the sublimator to avoid water backing up and filling the sublimator as a result of sudden pressure drop.
B) Variation in water pressure could cause water to back up and fill the sublimator.
