3.4 ACIDS
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What colour does methyl orange turn in an acid
Red
What colour is methyl orange in alkali and neutral
Yellow
What color is phenolphthalein in an acid and neutral
Colourless
What colour is phenolphthalein in an alkali
Pink
What colour would a strong acid be on universal indicator
Red
What would a weak acid be on universal indicator
Yellow
What colour is neutral on a universal indicator scale
Green
What would a weak alkali be on universal indicator
Blue
What would a strong alkali be on universal indicator
Purple
Define the term acid
A H+ Donor
Define the term alkali
A OH- donor
Acid + Base = ?
Salt + Water
Acid + Metal = ?
Salt + Hydrogen
What is the formula for ammonium
NH4+
What is the formula and charge for hydroxide
OH-
What is the formula and charge for nitrate
NO3-
What is the formula and charge for carbonate
CO3 (2-)
What is the formula and charge for sulphate
SO4 (2-)
What is the difference between alkalis and bases
Alkalis are soluble and bases aren’t
Acid + Carbonate = ?
Salt + Water + Carbon Dioxide
What is the test for hydrogen
A lit splint will make a squeaky pop in hydrogen
What is the concentration of nitrogen in the air
78%
What is the concentration of oxygen in the air
21%
What is the concentration of argon in the air
0.96%