# Determining solubility thresholds

Are there any sources that could provide Ksp value thresholds for things that are "completely soluble", "partially soluble", and "not soluble"?

• A $K_{sp}$ value is a parametric measurement but "completely soluble", "partially soluble", and "not soluble" are non-parametric measurements. So it seems you're asking about apples and oranges. Please clarify. Also note that solubility is significantly dependent on temperature which is another factor to consider. – MaxW Aug 18 '16 at 20:36
• I am looking for some rules of thumb for Ksp values such that if the Ksp is greater than x at 25C, it is refered to as "completely soluble". In my mind, anything with a Ksp value around that of NaCl I would say is "completely soluble". – J. Ari Aug 18 '16 at 20:49
• Then you already have a rule of thumb - don't expect better rules because they are no strict rules. – Mithoron Aug 18 '16 at 23:53