7 votes
Accepted

Does a solvent with the following properties exist?

There are many examples which clear the requirements. Here is a non-exhaustive list. I do not claim these data are absolutely accurate - you should cross-check everything if it matters to you. A ...
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6 votes
Accepted

Does zinc oxide lose its UV blocking properties when mixed with oil?

$\ce{ZnO}$ is not soluble in oils. But it can form dispersion in oils. $\ce{ZnO}$ may react with traces of fatty acids in oils, forming respective zinc salts. But for UV screening context, it is ...
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1 vote

Does solubility of acetic acid depend on the pH?

For the two specific substances, read the other answers and comments, they answer that part. I would say no (in both cases) because the protonating or deprotonating these molecules does not change ...
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