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why pH solutions in a beaker goes down and solution becomes more acidic after one day in preparation of hydrogen gas

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When water is exposed to air, it can dissolve carbon dioxide from the atmosphere to form carbonic acid (H2CO3), which can lower the pH of the solution. The carbonic acid then dissociates into hydrogen ions (H+) and bicarbonate ions (HCO3-), which can further contribute to the acidity of the solution.

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