1. Substances can be grouped as acidic, alkaline or neautral.
2. An acid has a sour taste and can change moist blue litmus paper to red.
3. An alkali has a bitter taste and can change moist red litmus paper to blue.
4. A neutral substance is tasteless, sweet or salty and does not change the colour of any litmus paper.
are Ph.D. and M.S. chemists, specialized in synthetic chemistry, process
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