When an acid meets a base, a salt is made. Common salt is only one of the family. In this course we learn the salts of daily life: what is made from common salt, how baking soda and washing soda differ, and what plaster of Paris does.
3 lessons, about 1 h 15 min3 simulations10 problems6 practice questionsPython in every lesson
Created by StemPy LabA salt is made when an acid and a base neutralise each other. Salts with the same positive or negative ion form a family. A salt of a strong acid and a strong base is neutral. One of a strong acid and a weak base is acidic, and one of a weak acid and a strong base is basic.
Electrolysis of salt solution gives sodium hydroxide, chlorine and hydrogen. Chlorine and slaked lime make bleaching powder. Baking soda is sodium hydrogencarbonate, used in baking and as an antacid. Washing soda is sodium carbonate with water of crystallisation.
Some salts hold molecules of water in their crystals, called water of crystallisation. Blue copper sulphate crystals lose it on heating and turn white. Gypsum loses three quarters of its water on heating to give plaster of Paris, which sets hard when mixed with water.
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