Acids and bases
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Define an acid
A proton donor A supplier of H+ ions
Define a base
A proton acceptor A source of OH- ions
State the difference between an alkali and a base.
Alkalis are soluble bases. All alkalis are bases but not all bases are alkalis.
What colour does red/blue litmus (paper) turn in hydrochloric acid
Red
What colour does red/ blue litmus (paper) turn in a hydroxide solution.
Blue
What colour does phenolphthalein turn in hydrochloric acid.
Colourless
What colour would phenolphthalein turn in hydroxide solution.
Bright pink
What colour does methyl orange turn in hydrochloric acid
Red
What colour does methyl orange turn in hydroxide solution
Yellow
What colour does UI solution turn in hydrochloric acid
Red
What colour does UI turn in hydroxide solution.
Blue
When do we use a paper indicator instead of a liquid indicator.
When testing a gas
What is an acid a source of
H+ ions
What is a base a source of
OH- ions
What is an acid in terms of protons
A proton donor
What is a base in terms of protons
A proton acceptor
Ammonia + hydrochloric acid —>
Ammonium chloride (neutral)
Is ammonia an alkali or an acid?
An acid
Metal + acid —>
Salt + hydrogen
What would you observe when reacting magnesium and hydrochloric acid?
Effervescence
What gas is produced when reacting magnesium and hydrochloric acid
Hydrogen
Metal oxide + acid —>
Salt + water
Copper oxide + hydrochloric acid
Copper chloride + water
Sodium hydroxide + hydrochloric acid
Sodium chloride + water