Acid salt - salts formed when proton(s) in a dibasic or tribasic acid is not fully replaced 

Acid-alkai indicator - a compound which would shows different colour according to their pH value

Antacid - substances that used to neutralize acid in stomach

Chloride - a compound that contain chloride ion

Exothermic reaction - chemical reactions which release heat

Joule - A unit of energy

Neutralization - a chemical reaction that an acid reacts with a base to form a salt and water

Normal salt - salts formed when proton(s) in an acid is fully replaced 

Precipitation - a reaction that precipitate forms when ions of the insoluble salt combine

Quicklime - the common name for calcium oxide

Slaked lime - the common name for calcium hydroxide

Titration - a quantitive analysis used to determine the concentration of an acid or alkali in a sample by neutralization using an indicator