A substance that counteracts or neutralizes alkali; an acid or acidifying agent.
From anti- 'against' + alkali (from Arabic al-qali 'plant ashes used in making soap'). The word reflects 17th-century chemistry when scholars were mapping out opposite substances.
Antalkali belongs to a vanished era of chemistry terminology—before scientists developed the pH scale and proton theory, they described substances by what they opposed. It's like how 'phlogiston' was a placeholder theory before chemistry became modern.
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