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When adding H20 into a crushed Alka Seltzer, what happens?

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does it have any changes? is it physical or chemical? why?

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  1. Alka-Seltzer is a combination of aspirin (acetylsalicylic acid, C9H8O4), sodium bicarbonate (NaHCO3), and citric acid (C6H8O7), designed to treat pain and simultaneously neutralize excess stomach acid.

    When adding H20 into a crushed Alka Seltzer, all chemicals, aspirin (acetylsalicylic acid, C9H8O4), sodium bicarbonate (NaHCO3), and citric acid (C6H8O7), react and dissolve into water.  Dissolution is a physical change, but acid-base reaction to generate carbon dioxide is a chemical change.

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