.jpg "Easy way to answer AP POLYCET 2022 | Polycet Chemistry | Acids, Bases and Salts | live Quiz -9")
- Acid-base indicators are dyes or mixtures of dyes which are used to indicate the presence of acids and bases.
- Acidic nature of a substance is due to the formation of H+ (aq)ions in the solution. The formation of OH- (aq)ions in the solution is responsible for the basic nature of a substance.
- When a base reacts with metal with the evolution of hydrogen gas, a salt is formed. When an acid reacts with a metal carbonate or metal hydrogen carbonate gives the corresponding salt, carbon dioxide gas and water.
- Acidic and basic solutions in water conduct electricity because they produce hydrogen ions and hydroxide ions respectively.
- The strength of an acid or an alkali can be tested by using a scale called the pH scale (0-14) which gives the measure of hydrogen ion concentration in a solution.
- A neutral solution has a pH of 7, while an acidic solution has a pH of less than 7 and a basic solution has a pH more than 7.
- Living beings carry out their metabolic activities within an optimal pH range.
- Mixing concentrated acids or bases with water is a highly exothermic process.
- Acids and bases neutralize each other to form corresponding salts and water.
- The water of crystallization isthe fixed number of water molecules chemically attached to each formula unit of salt in its crystalline form.
- Salts have various uses in everyday life and in industries.
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