When combined with DI, my 98% calcium hydroxide resulted in a pink solution. I am trying to make limewater for a class demonstration and have only ever seen limewater as a colourless solution. Anyone else had this issue?
Thanks!
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3$\begingroup$ Why organic-chemistry tag? Is there an organic substance or indicator present in the solution? DI usually stands for "deionized". Deionized what, water? How clean was the glassware? Could you upload a photo and specify lighting conditions to eliminate possible light scattering effects? $\endgroup$– andselisk ♦Feb 9, 2022 at 11:32
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2$\begingroup$ Try different water ( even tap one ) and different glassware/vessel. Still pink ? If still pink then my educated guess says there must be a pink dye in the calcium hydroxide lot. If not there may be dye contamination of the vessel, possibly some phenolphthaleinum from prior activities. $\endgroup$– PoutnikFeb 9, 2022 at 11:48
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$\begingroup$ Thank you for your responses, it seems a phenolphthaleinum contamination was the issue and subsequent attempt to make limewater have resulted in a clear solution. Thanks! $\endgroup$– Christian DaniellFeb 9, 2022 at 11:53
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$\begingroup$ It's almost as if there were phenolphthalein in the solution. $\endgroup$– Oscar LanziFeb 9, 2022 at 14:41
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