<p>Strong bases are bases which completely dissociate in water into the cation and OH<sup>-</sup> (hydroxide ion). The hydroxides of the Group I and Group II metals usually are considered to be <a href="https://www.thoughtco.com/strong-and-weak-acids-and-bases-603667" data-inlink="46PcSqOU69fdy_BHPg1ZjA&#61;&#61;" data-type="internalLink" data-component="link" data-source="inlineLink" data-ordinal="1">strong bases</a>. Here is a list of the most common strong bases.</p><ul><li>LiOH - lithium hydroxide</li><li>NaOH - sodium hydroxide</li><li>KOH - potassium hydroxide</li><li>RbOH - rubidium hydroxide</li><li>CsOH - cesium hydroxide</li><li>*Ca(OH)<sub>2</sub> - calcium hydroxide</li><li>*Sr(OH)<sub>2</sub> - strontium hydroxide</li><li>*Ba(OH)<sub>2</sub> - barium hydroxide</li></ul>* These bases completely dissociate in solutions of 0.01 M or less. The other bases make solutions of 1.0 M and are 100% dissociated at that concentration. There are other strong bases than those listed, but they are not often encountered.