영어가 매우 매우 짧은 까닭에 해석을 잘 못하겠네요..

아래는 문제의 문장입니다.

A portion was dissolved in 0.3 ml of tri-fluoroacetic acid with 50 mg of 5 percent Rh on Al2O3 to which was added 25 curies of [3H] water.

음, to which 에서 which가 나타내는 게 앞에있는 0.3 ml of tri-fluoroacetic acid with 50 mg of 5 percent Rh on Al2O3 인가요,

아니면 with 뒷 부분만 나타내는 건가요?