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Acid;- the substance which are sour in taste and turn blue litmus to red are called acid

bases;- the substance which are bitter in taste and turn red litmus to blue are called bases

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 Vinegar, lemon juice, and many other foods taste sour things taste sour – because they are all acids.
Acids taste sour, are corrosive to metals, change litmus red, and become less acidic when mixed with bases.

Bases feel slippery, change litmus blue, and become less basic when mixed with acids..
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