NCERT Solutions for Class 7 Science Chapter 5:Acids, Bases and Salts

As the chapter's name suggests, the chapter deals with the nature of the substances that we see, eat or apply in everyday life. Method of neutralisation of an ant bite and neutralisation of factory waste has been discussed in this chapter. It further discusses as to how one can find out the nature of the substance through different tests. The chapter concludes by discussing the process of neutralisation. Students must be attentive during the classes where this chapter is taught as it is the basics of many chemistry procedures and studies. The following are the points discussed in the chapter:

• Acids taste sour while bases taste bitter.
• Acid turns blue litmus red, and bases turn red litmus blue.
• Substances which are neither acidic nor basic are called neutral.
• Solutions of substances that show different colour in acidic, basic and neutral solutions are called indicators.
• An acid and a base neutralise each other and form a salt. Neutralisation is a chemical reaction in which an acid and a base react with each other to produce salt and water. Heat is evolved in the process of neutralisation. A salt may be acidic, basic or neutral in nature.