First observation is that the load will be approximately resonant, but fairly lossy, and both the resistive and reactive components may vary widely depending on the nature of the particular electrolyte under test.
Rapid rise and fall times will be impossible to achieve in a resonant circuit. Resonant circulating energy always tries to revert to a sine wave. Driving a resonant circuit with a square wave could cause the cell voltage to be either square, sine, or some unpredictable distorted version of both, depending on the quality of the resonance.
The required drive level power of 200 watts is fairly significant power that must be provided, and almost all of that is going to go into heating up your electrolyte.