What are the physical differences between acids and bases? (3 marks)
Answers
acid
taste sour when they are eaten
can sting the skin when they are touched
can corrode (or eat away at) metals and skin
can be used as a reactant during electrolysis due to the presence of mobile ions
turn blue litmus paper red
are studied in chemistry and biology
turn red or orange on universal indicator
base
Bitter taste (opposed to sour taste of acids)
Slimy, or soapy feel on fingers
Many bases react with acids and precipitate salts.
Strong bases may react violently with acids. An acid spill can be safely neutralised by using a mild base.
Bases turn red litmus paper blue
Bases are substances that contain metal oxides or hydroxides
Bases which are soluble in water form alkalis (soluble bases)
1.acids turns blue litmus to red,bases from red to blue .
2. acids have pH less than 5, bases more than 5
3.acids corodes metals,bases dont.