acids, bases and salts- 5
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14 Terms
what colour does red litmus paper turn
blue- alkaline
red- acidic and neutral
what colour does blue litmus paper turn
red- acidic
blue- alkaline and neutral
what is 0-6 phs
acid
what is 8-14 phs
alkali
methyl orange appearance
red- acidic
yellow- alkaline
orange- neutral
phenolphthalein appearance
colourless- acidic and neutral
pink- alkaline
what is a base
a metal oxide or hydroxide that neutralises an acid to produce a salt or water (don’t dissolve in water)
what is a salt
a compound formed when some or all of the hydrogen ions in an acid are replaced by metal ions or ammonium ions
what are neutralisation reactions
exothermic
reaction of a base and acid
acid+base→salt+water
reaction of acid and metal
acid+metal→salt+hydrogen
reaction of acid and metal carbonate
acid+metal carbonate→salt+water+carbon dioxide
reaction of acid and metal hydrogencarbonate
acid+metal hydrogencarbonate→salt+water+carbon dioxide
reaction of acid and ammonia
acid+ammonia→ ammonium salt
