Acid is a substance which sour in taste and it liberates  H+ ions in aqueos solution.
Base is a substance which liberates OH- ions aqeous solution.

base are substances that I aqueous solution, slippery to the touch, taste bitter change the colour of indicators react with acid to form salts and promote chemical reactions

base can be thought of as the chemical opposite of acids. but some strong acids are able to act as bases

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