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Measuring [NaOH] in a working vacuum evaporator.

Measuring [NaOH] in a working vacuum evaporator.

Measuring [NaOH] in a working vacuum evaporator.

(OP)
How can the concentration of NaOH,  in water solution,  be measured while the solution is in a vacuum evaporator?  The goal is to take the concentration to say 28% to cause the precipitation of a crystalline material.

My list of potentials include pH, Conductivity, Density and Viscosity.

I also suspect it might be beneficial to remove a stream of the solution and filter the precipitate on a "continual" basis,  as there will be approximately 10% solids when the endpoint is reached.  If the stream is removed, the concentration measurement might be simplified.

I would appreciate any comments.

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