 The ionisation of bases works the same way and it also works the same way as ionisation for solutions, ions in solution. You can see again and I'll shortcut the process by identifying that my sodium hydroxide pellets are solids and therefore the solid will not participate in the reaction. So as we did before for the ionisation this will be the concentration of sodium ions multiplied by the concentration of OH- ions. The general expression here when we're looking at the equilibrium constant is that the equilibrium constant can often have the subscript kb which is an indication that this is a base. Bases tend to accept hydrogen ions from acids and therefore sometimes we can use a general form in order to identify that as well. For now most of the bases that you will be encountering until we look at acids and bases in more detail in the next topic will be of this kind of similar sort of form and therefore can be written as the product of the soluble ions. And that's the same sort of logic that we've used when we were looking at ions in solution previously. Then these ones are ones we can investigate a little bit more in the laboratory and hopefully you'll have the opportunity to do that. Thank you for watching.