I want to store a water/methanol mixture (with added salts) in a plastic centrifuge tube. I know organic solvents (like ethyl acetate, acetone, and acetonitrile) can dissolve plastic....does methanol?
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That depends on the chemical structure of the plastic. If it is made of polyethylene or polycarbonate, then no. If the concentration is less than 50% methanol, you probably won't have an issue, especially with the salts present. Go to the link below, plug in alcohol: methyl and look for the various plastics that could make up your centrifuge tube.
