Acid= a substance that dissolves in water to produce hydrogen ions.
Acid is a substance which tastes sour although tasting is not recommeneded as it can be posionous. Acid often suggest a substance burns or corrodes, but many acids are quite harmless. Indeed, much of what we eat and drink contains one or more acids.
The chemical opposite of acids is a base. Bases that are soluble in water are called alkalis. Alkalis are much more harmfull them acids and therefore need to be treated with care. Subtances that are neither acid or alkalis properties ar neutral(E.g pure water).
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