[curiouscat]

I have a Ca(OH)2 slurry which contains mostly Ca(OH)2 (probably ~90% w/w on dry basis) but also some amounts of CaCO3 and inert solids (mostly SiO2 we suspect). What'd be a good way to obtain the composition.

This is only a rough, quick analysis, so not talking about controlled highly accurate protocols but just something that'd be a first order estimate.

Ideas I had were drying to get dry weight and then maybe a titration against HCl to get CaCO3 + Ca(OH)2? Or passing CO2 to find the net weight increase? Sounds a bit cumbersome though.

Strongly suspect I'm needlessly reinventing the wheel here. 

[Borek]

No idea if it will work, as CaCO₃ is insoluble, but perhaps some variation of the Warder titration?

http://www.titrations.info/acid-base-titration-sodium-hydroxide-and-carbonate

I would start with a slow titration with agitation, preferably with pH recorder to see if it is possible to see two equivalence points.

[curiouscat]

Thanks! That does sound pretty tricky.