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I have $\approx\pu{2 g}$ of elemental sulfur that I need to convert to dissolved sulfate in DI water. What's the easiest lab chemistry that will get me there?

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You burn the sulfur and lead the fumes through a solution of $\ce{H2O2}$. Afterwards you boil that solution for a moment to remove the rest of the peroxide.

Use a vertical tube reactor or something so you can lead a soft stream of oxygen gas (or pressurised air, in a pinch) over the sulphur.

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