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oil and vinegar do not form a solution, oil does not disolve in vinegar, which is approximately 95% water.
Yes water and vinegar form a stable solution.
Oil and vinegar are not miscible.
Oil and vinegar form a heterogeneous mixture.
Oil and Vinegar do not dissolve in each other, therefore it is a mixture.
Vinegar is a mixture that contains a solution of acetic acid., Depending on the type of vinegar there may be solids suspended e.g. in balsamic vinegar.
Oil has a lower density than vinegar. When oil and vinegar are mixed, the oil rises, or floats to the top.
Because I pooped yesterday
A solution of vinegar is obtained with a layer of oil on the top.
Irreversible
If you mean to make a dressing and you want the mixture to blend together, add the oil very slowly to the vinegar while whisking briskly the entire time.
Vinegar and oil will separate. Shaking it mixes them together.