A quick search on Google tells me that it is only used for ionic compounds but I think it should be used for some covalent compounds given that some of the covalent compounds also dissociate into ions when they dissolve (like most acids)
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$\begingroup$ You can use it because there is always a mix of characteristics. Only that it will be extremely small. $\endgroup$– ProscionexiumCommented Oct 27, 2023 at 17:56
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$\begingroup$ It can be used with any equilibrium process. $\endgroup$– ZheCommented Oct 27, 2023 at 18:02
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$\begingroup$ Ksp is an equilibrium constant assuming that the dissolved compound dissociates completely. For compounds that are only partially dissociated (eg weak acids), it is not applicable. In those cases a total observed solubility at a specific pH is necessarily used instead. $\endgroup$– AndrewCommented Oct 27, 2023 at 19:07
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