This document discusses acids and bases. It defines acids as substances that produce hydrogen ions in water and bases as substances that react with acids to form salts and water. It describes the chemical properties of acids and bases, including their tastes, pH levels, and ability to conduct electricity. Common acids like sulfuric acid and bases like sodium hydroxide are discussed along with their uses. The roles of water in producing hydrogen and hydroxide ions are explained. The pH scale is introduced as a measure of acidity and alkalinity. Strong and weak acids and bases are differentiated based on their ionization in water.

1. Chapter 7ACIDS AND BASES

2. What is acid?a substance that ionizes in water to produce hydrogen ions, H+What is base?a substance that reacts with an acid to form only salt and waterWhat is alkali?Soluble bases that produce OH¯ ions in waterChemical properties of acid Sour taste

3. pH less than 7

4. Corrosive

5. Conduct electricity

6. Acid can react with a) bases to produce salts and water b) metals to produce salts and hydrogen gas c) carbonates to produce salts , carbon dioxide gas and water

7. Chemical properties of base Bitter/smooth/soapy

8. pH more than 7

9. Corrosive

10. Conduct electricity

11. Base can react with a)Acid to produce a salt and water b)Heated with ammonium salt to produce ammonia gasvideo

12. Uses of acids in daily lifeSulphuric acid – paints, detegents, polymers, fertilisers

13. Carbonic acid- make carbonated drinks

14. Ethanoic acid- vinegarUses of base in daily lifeSodium hydroxide – soaps, detergents, bleaching agents

15. Magnesium hydroxide – toothpaste

16. Ammonia- fertilisersRole of water in the formation of hydrogen ionsIn the presence of water, an acid will ionize to form the hydrogen ions, H+