|scientists prepared the ____ of solution for their next experiment.|
The answer is VAIL
Scientists prepared the vial of solution for their next experiment.
Vial is a small container, in cylindrical shape having glass material. It can be used especially for holding liquid medicines etc. Most labs have this to science experiments.
while Vile is used as an adjective which means unpleasant, immoral and unacceptable.
And Viol is anyone of a family of bowed, fretted and stringed instruments with hollow wooden bodies.