U1-3-0 - N4 Revision Flashcards
What is a pH scale?
A measure of the hydrogen ion concentration in a solution.
Low pH = high concentration
Acidic solutions have pH…
less than 7.
Alkaline solutions have pH…
more than 7.
Neutral solutions have pH…
equal to 7.
Base
A substance which can neutralise an acid
Acid
Substance which contains hydrogen ions (H+)
Alkali
Soluble base
Sodium chloride is a salt.
Where does the ‘sodium’ part come from?
Parent base
(sodium oxide, hydroxide or carbonate)
Sodium chloride is a salt.
Where does the ‘chloride’ part come from?
Parent acid
(hydrochloric acid)
Phosphoric acid makes …. salts.
phosphate
Sulfuric acid makes …. salts.
sulfate
Colour of universal indicator in acid
Red
(red/orange/yellow)
Colour of universal indicator in alkalis
Blue/purple
Colour of universal indicator in neutral solutions
Green
