Question

define acids and baces with example

Answer 1

curd,lemon or orange juice and vinegar taste sour.these substances taste sour because they contain acids.
substances which taste bitter and feel soapy on touching are known as bases like baking soda.

Answer 2

it is a molecule or other species which can donate a proton or accept an electron pair in reactions.
ex:- lactic acid, malic acid.

bases is a compound that yields hydroxide ions  when in aqeous solution. They have a bitter taste.
ex:- tooth paste and some cleaning items which contain ammonia and so are examples of bases.