distinguished between acid and alkaline
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An acid is a substance which donates hydrogen ions into solution, while a base or alkali is one which takes up hydrogen ions.
Acids have a pH less than 7. Alkalis have a pH greater than 7 Neutral substances have a pH equal to 7. ... Acids contain lots of hydrogen ions, which have the symbol H+. Alkalis contain lots of hydroxide ions, symbol OH-.
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