CHEM Questions!!! Please Help!!!

[ggxoxo]

So just to get this straight- so we don't use it to lower the concentration of the primary standard because it is so strong that we have to dilute to a weaker form that is suitable in a classroom setting???

[ggxoxo]

I don't know if I'm missing something here but if NaOH is not a good primary standard, instead of standardising it, why can't we just use a different base that is actually a good primary standard?

Also, what would happen to measurement if the tip of the burette was not filled with liquid before doing the titration?

Thank you!!!

[Reckoner]

Also, what would happen to measurement if the tip of the burette was not filled with liquid before doing the titration?

You would be titrating less volume than the readings are telling you (some of the solution will fill the tip, and not mix with the other solution). This would result in you calculating a higher concentration for the unknown.