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23A. Chemistry lab tube (7) ---E-T-.
9D. Change into another form (9) T-A-S---E.

My problem is that these overlap so the second letter in 23A. is the seventh in 9 down. Is it pipette and transpire?? Thanks.

TRANSMUTE, I think

........so BURETTE? "tube" is a poor definition, though)

"Burette" is new on me......thanks Chris.....

Briefly, it's the graduated "tube" with a tap on the end, used in titration - the pipette is used to measure one liquid into a flask, then another liquid is added from the burette until a colour change is seen, and the volume required is recorded.