Chemical substances can be acids or bases on the basis of presence of positively charged hydronium ion and negatively charges hydroxyl ions in the compound.
A chemical substance is a form of matter which have a constant chemical composition and characteristic properties which are unique. However, chemical substances cannot be separated into its constituent elements by the application of physical separation methods, i.e., without breaking the chemical bonds.
Chemical substances are of two types depending upon the presence of positively charged hydronium ions and the negatively charged hydroxyl ions. If there are more negatively charged hydroxyl ions than the positively charged hydronium ions, then the substance becomes a base however if there are more positively charged hydronium ions than the negatively charged hydroxyl ions then the substance is called an acid.
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Substances made with hydrogen ions are acidic. Substance made with hydroxide ions are bases. It depends on which ions they are made of.
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