Aspirin manufactured since 1899 is the most well-known pain killer of our days. The chemical name of the active pain-killing ingredient in aspirin is acetylsalicylic acid.
Formula of aspirin: C9H8O4 (Relative Atomic masses: C = 12, H = 1, O =16) Solubility of acetylsalicylic acid: 1 g / 100 g water at 37oC
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