Acids and bases are two of the most important classes of compounds in chemistry. Surprisingly, it took chemists many years to agree on just what made an acid an acid and a base a base.
From experience, we understand that acids and bases have certain characteristics. For example, acid solutions taste sour and base solutions bitter. (Obviously, you should never taste any laboratory chemical, but the sour taste of edible acids such as lemon juice and vinegar is familiar to most people, as is the bitter taste of edible bases such as baking soda and quinine water). Acid solutions generally have an astringent ...
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