Given a scientific question, generate a correct answer to it.

Example input: Who proposed the theory of evolution by natural selection?
Example output: darwin
Example explanation: This is a direct fact that Charles Darwin proposed the theory of evolution.
Q: Sulfate is used as a cleaning agent because it is acidic and soluble in what substance?
A:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
water