Why must the test tubes be thoroughly cleaned and dried when one part of the procedure is completed before starting the next part of the procedure ?

Question

Please help me with this, thankyou so much!

Answer 1

Don't you want to make sure that all of the old gunk is out of the tube before putting in new stuff?

Answer 2

yes i know the answer too , but i don't know how to word it, lol that's why i posted it:)

Answer 3

Wash and dry the test tubes thoroughly to be sure any new substances are not contaminated by any other substance.

Answer 4

thank you Ms.Sue:)

Answer 5

You're welcome, Sky.