Yes, TITRATIONS is a Scrabble word!

Letter values in Scrabble US: T 1, I 1, T 1, R 1, A 1, T 1, I 1, O 1, N 1, S 1.

Is it a valid word?

TITRATIONS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

a measured amount of a solution of unknown concentration is added to a known volume of a second solution until the reaction between them is just complete; the concentration of the unknown solution (the titer) can then be calculated