Yep - works for most chemicals/solutions: store them in the fridge! Depending on how stable, or unstable, a chemical is, its life can be extended by years, sometimes.
One thing to watch out for: freezing or solid material appearing - either of which may occur above 0 C (32 F), depending on the chemical (those used for developing photos should be fine though). Store a small sample for a few days to check this, raising the fridge temp. if necessary.
(A chemist)