Acid, Base and their Properties presentation
- 1. Subject: Chemical Foundation of Biochemistry-I Dr. Neetika Naudiyal Assistant Professor, Department of Life Sciences, Kristu Jayanti College (Autonomous), Bengaluru Acid, Base and their Properties
- 2. What is an acid? ▪ An acid is a solution that has an excess of H+ ions. ▪ It comes from the Latin word acidus that means "sharp" or "sour". ▪ The more H + ions, the more acidic the solution.
- 3. Properties of an Acid ▪ Turns blue litmus paper red. ▪ Tastes Sour ▪ Conduct Electricity ▪ Corrosive, which means they break down certain substances. Many acids can corrode fabric, skin, and paper. ▪ Some acids react strongly with metals/ Picture from BBC Revision Bites http://www.bbc.co.uk/schools/ks3bitesize/science/chemistry/acids_bases_1. shtml
- 4. Uses of Acids 1. Acetic Acid = Vinegar 2. Citric Acid = lemons, limes, & oranges. 3. Ascorbic acid = Vitamin C which is required by the body to function. 4. Sulfuric acid is used in the production of fertilizers, steel, paints, and plastics. 5. Car batteries
- 5. What is a base? ▪ A base is a solution that has an excess of OH- ions. ▪ Another word for base is alkali. ▪ Bases are substances that can accept hydrogen ions
- 6. Properties of a Base ▪ Turns red litmus paper blue. ▪ Feel Slippery ▪ Taste Bitter ▪ Corrosive ▪ Can conduct electricity ▪ Do not react with metals.
- 7. Uses of Bases ▪ Bases give soaps, ammonia, and many other cleaning products some of their useful properties. ▪ The OH- ions interact strongly with certain substances, such as dirt and grease. ▪ Chalk and oven cleaner are examples of familiar products that contain bases. ▪ Human blood is a basic solution.
- 9. Acid – Base Reactions A reaction between an acid and a base is called neutralization. An acid-base mixture is not as acidic or basic as the individual starting solutions.
- 10. Acid – Base Reactions Each salt listed in this table can be formed by the reaction between an acid and a base.
- 11. pH Scale ▪ pH is a measure of how acidic or basic a solution is. ▪ The pH of a solution varies from 0 to 14. ▪ Solutions pH= 0 to 7 on the pH scale are termed as acidic solutions. ▪ Solutions pH= 7 to 14 on pH scale are known as basic solutions. ▪ Solutions pH= 7 to 14 on pH scale are known as neutral solutions. ▪ Solutions having the value of pH equal to 0 are known to be strongly acidic solutions. The acidity decreases as the value of pH increases from 0 to 7. ▪ Solutions with the value of pH equal to 14 are termed as strongly basic solutions. The basicity decreases as the value of pH decreases from 14 to 7. ▪ The strength of acids and bases depends on the number of H+ and OH– ions produced.