This chapter mainly describes the chemical nature of acids, bases and salts, their reaction with metals, non-metals and with each other. We all know that acids are sour and change the colour of blue litmus to red, whereas bases are bitter and change the colour of the red litmus to blue. You will get to understand the chemical properties of acids and bases. How acids and bases react with metals, how do metal carbonates and metal hydrogen carbonates react with acids, how do acids and bases react with each other. The reaction of metallic oxides with acids and reaction of a non-metallic oxide with base explained with suitable examples and various chemical reactions.