How does solubility affect precipitation reactions?

[sveioen]

Having a day at the lab tomorrow, and one of the pre-lab-questions is

Why must the receiving flask, funnel and filter paper be dry when filtering the saturated solutions? Why don't the KHT buret and the titration flask have to be dry before use?

Anyone got a clue about this one?

 

[lightarrow]

Having a day at the lab tomorrow, and one of the pre-lab-questions is

Why must the receiving flask, funnel and filter paper be dry when filtering the saturated solutions? Why don't the KHT buret and the titration flask have to be dry before use?

Anyone got a clue about this one?

1. Which is the exact process?
2. What's a KHT buret (I'm no familiar with english technical terms).