Nota Terkini

Monday, July 13, 2009

[Science Form 2] Acids vs Alkalis

Acids
  • Taste: Sour.
  • Touch: Like water.
  • Tested with litmus paper: Turn blue litmus red.
  • pH value: From 0 to less than 7.
  • Reaction with metals: Form hydrogen and a salt.
  • Reaction with carbonates: Form a salt, water and carbon dioxide.
  • Reaction with ammonium compounds: No reaction.

Alkalis
  • Taste: Bitter.
  • Touch: Soapy.
  • Tested with litmus paper: Turn red litmus blue.
  • pH value: From above 7 to 14.
  • Reaction with metals: No reaction.
  • Reaction with carbonates: No reaction.
  • Reaction with ammonium compounds: Give off ammonia gas.

Note: Strong acids and alkalis are corrosive and dangerous
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