ACID vs ALKALI

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ACID:noun
a substance with a sour taste that
forms a salt when mixed with an alkali
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Acidic:Adjective: 
Source: Merriam-Webster's Learner's Dictionary

ALKALI:noun
a substance that has a bitter taste and
that forms a salt when mixed with an acid
​
Alkaline: Adjective 
Source: Merriam-Webster's Learner's Dictionary

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TESTING for ACID or ALKALI

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T h e ~ L I T M U S ~ T E S T
INDICATES if a substace is Acid or Alkali

Red litmus paper Turns BLUE 
in ALKALINE conditions.

Blue litmus paper Turns RED  in ACID conditions.

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U N I V E R S A L ~ I N D I C A T O R
INDICATES the specific amount of Acidity or Alkalinity