Hydroxide compounds are generally insoluble. Which cations are the stated exceptions?

1. Compounds containing OH- sit in the insoluble column of the guidelines. 2. The exceptions named are hydroxides of group 1 metal cations and of Ba2+. 3. So NaOH and KOH dissolve freely, and Ba(OH)2 dissolves as well. 4. Mg(OH)2 has no such exception, which is why milk of magnesia is a suspension rather than a solution. 5. Silver, lead and iron hydroxides follow the general insoluble rule. _Source: OpenStax Chemistry (CC BY 4.0), Ch 4 "Stoichiometry of Chemical Reactions", section 4.2 Classifying Chemical Reactions_