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    $\begingroup$ How precise and accurate must this be? How frequently? For a quick test, could you calibrate conductivity between two point (insulated up to tip) Pt electrodes in a droplet? Test the effect of droplet size, temperature and other variations, as well as check if there are contaminants that might affect conductivity. See sulphuric-acid.com/TechManual/Properties/… N.B. The curve may have more than one concentration for a conductivity value. $\endgroup$
    – DrMoishe Pippik
    Commented Oct 13, 2022 at 22:54
  • $\begingroup$ If you have access to a micropipette, you could do titration with a known concentration of a strong base using very small volumes. Micropipettes come in different volume ranges, but some can go as low as 0.1 microliters. $\endgroup$
    – Sam202
    Commented Oct 14, 2022 at 0:06
  • $\begingroup$ "10s of microliters" isn't much lower than a drop of water. IIRC a normal drop can be about 50 microliters. You could even don't dilute, just use some small electrodes. $\endgroup$
    – Mithoron
    Commented Oct 14, 2022 at 0:32
  • $\begingroup$ Maybe turbidimetry or nephelometry? Add the small sulfuric acid droplet to 1 mL of barium chloride solution with standardized concentration. Then barium sulfate is produced, yielding a turbid solution. Calibration would be required. Good luck with whatever you decide to do! $\endgroup$
    – Ed V
    Commented Oct 14, 2022 at 14:06
  • $\begingroup$ @DrMoishePippik indeed! Is "Sulfuric acid... makes a poor electrolyte... very little of it will dissociate into ions" really true? What does that actually mean? and Details of what actually happens in cold sulfuric acid between 80 and 90%; what molecular changes cause the viscosity to skyrocket? $\endgroup$
    – uhoh
    Commented Oct 15, 2022 at 2:06