 So this one is very similar to the ones we were just answering It says which member of the pair is the stronger base So do you remember how to determine which one is the stronger base? Is it this one or this one? NaOH NaOH And why would you say that? Because of the hydroxyl group Hydroxide ion, right? No, it's totally okay So a hydroxide ion, right? Remember when it breaks up Na+, that's always a suspected ion But that's the thing that makes the pH go up So this is the base part So the hydroxide ion here So whenever you see that thing So strong base Okay, so this one here Do you remember what we said about amines? So this is amine Weak base Sorry, weak base No, that's alright So remember amines have that lone pair on it Okay, so if you want to think about this in desperate theory So this is trigonal pyramidal We'll just say CH3 We're concerned about this nitrogen Being the central atom Of course there's molecular geometry around this tetrahedral But here we've got a trigonal pyramidal molecular geometry But what this lone pair can do Is accept a proton So since that can accept a proton We call it a base But it doesn't have an ionizable hydroxide ion on it So what we call it is not a strong base But weak base Strong base