3.4 Atmosphere & acids
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What is pH < 7?
acidic
What is acidic?
pH < 7
What is pH = 7
neutral
What is neutral?
pH = 7
What is pH > 7?
alkaline
What is alkaline?
pH > 7
What is a strong acid?
0-3
What is the colour of a strong acid on the universal indiator?
red
What is a weak acid?
3-6
What is the colour of a weak acid on the universal indictaor?
orange 3-4 yellow 5-6
What is the colour of a neutral substance on the universal indicator?
green
What is a weak alkali?
8-10
What is the colour of a weak alkali on the universal indicator?
light blue
What is a strong alkali?
11-14
What is the colour of a strong alkali on the universal indicator?
dark blue 11-13 purple 14
What is the colour of an acid in methyl orange?
red
What is the colour of a neutral in methyl orange?
yellow
What is the colour of an alkali in methyl orange?
yellow
What is the colour of an acid in phenolphthalein?
colourless
What is the colour of a neutral in phenolphthalein?
colourless
What is the colour of an alkali in phenolphthalein?
pink
What is the colour of an acid using red litmus paper?
red
What is the colour of a neutral using red litmus paper?
red
What is the colour of an alkali using red litmus paper?
blue