Chapter 3
This presentation is the property of its rightful owner.
Sponsored Links
1 / 17

Section 2 Acids and Bases PowerPoint PPT Presentation


  • 80 Views
  • Uploaded on
  • Presentation posted in: General

Chapter 3 Chemical Compounds. Section 2 Acids and Bases. Section 2 Acids and Bases. Chapter 3. Acids and Their Properties. An acid is any compound that increases the number of hydronium ions , H 3 O + , when dissolved in water.

Download Presentation

Section 2 Acids and Bases

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Section 2 acids and bases

Chapter 3 Chemical Compounds

Section 2

Acids and Bases


Section 2 acids and bases

Section 2 Acids and Bases

Chapter 3

Acids and Their Properties

  • An acid is any compound that increases the number of hydronium ions, H3O+, when dissolved in water.

  • Hydronium ions form when a hydrogen ion, H+, separates from the acid and bonds with a water molecule, H2O, to form a hydronium ion, H3O+.


Section 2 acids and bases

Section 2 Acids and Bases

Chapter 3

Acids and Their Properties,continued

  • Acids Have a Sour Flavor

    • Lemons, limes, and other citrus fruits are sour as a result of citric acid.

    • Taste, touch, or smell should NEVERbe used to identify an unknown chemical.

    • Many acids are corrosive, which means that they destroy body tissue, clothing, and many other things.

    • Most acids are also poisonous.


Section 2 acids and bases

Section 2 Acids and Bases

Chapter 3

Acids and Their Properties,continued

  • Acids Change Colors in Indicators

    • A substance that changes color in the presence of an acid or base is an indicator.

  • This flask contains water and an indicator called bromthymol blue.


Section 2 acids and bases

Section 2 Acids and Bases

Chapter 3

Acids and Their Properties,continued

  • When acid is added, the color changes from pale blue to yellow because of the presence of the indicator.

  • Another common indicator used in the lab is litmus. Paper strips containing litmus change color when acid is added.


Section 2 acids and bases

Section 2 Acids and Bases

Chapter 3

Acids and Their Properties,continued

  • Acids React with Metals

    • Acids react with some metals to produce hydrogen gas.

    • When hydrochloric acid reacts with zinc metal, hydrogen gas is formed.

    • Equation:

  • 2HCl + Zn  H2 + ZnCl2


Section 2 acids and bases

Section 2 Acids and Bases

Chapter 3

Acids and Their Properties,continued

  • In the reaction, zinc displaces hydrogen in the compound, hydrochloric acid. This displacement happens because zinc is an active metal.

  • Silver would not react -- not an active metal.


Section 2 acids and bases

Section 2 Acids and Bases

Chapter 3

Acids and Their Properties,continued

  • Acids Conduct Electric Current

    • Acids are dissolved in water

    • Break apart

    • Form ions in the solution

      • The ions make it possible for the solution to conduct an electric current.

  • Example: car battery

    • The sulfuric acid in the battery conducts electricity to help start the car’s engine.


Section 2 acids and bases

Section 2 Acids and Bases

Chapter 3

Acids and Their Properties, continued

  • Uses of Acids

    • Sulfuric acid is the most widely made industrial chemical in the world. It is used to make paper, paint, detergents, fertilizers and many other products.

    • Nitric acid is used to make fertilizers, rubber, and plastics.

    • Hydrochloric acid is used to make metal from their ores by separating the metals from the material with which they are combined.


Section 2 acids and bases

Section 2 Acids and Bases

Chapter 3

Acids and Their Properties, continued

  • Hydrochloric acid is used in swimming pools to help keep them free of algae. Also found in your stomach, where it aids in digestion.

  • Citric acid and ascorbic acid (Vitamin C) are found in orange juice.

  • Carbonic acid and phosphoric acid help give soft drinks a sharp taste.


Section 2 acids and bases

Section 2 Acids and Bases

Chapter 3

Bases and Their Properties

  • A base is any compound that increases the number of hydroxide ions, OH-, when dissolved in water.

  • Example, sodium hydroxide breaks apart to form sodium ions and hydroxide ions

  • NaOH Na+ + OH-


  • Section 2 acids and bases

    Section 2 Acids and Bases

    Chapter 3

    Bases and Their Properties, continued

    • Hydroxide ions give bases their properties.

    • Examples of bases include:

    • Soaps

    • Ammonia

    • Baking soda

    • Bleach

    • Detergents


    Section 2 acids and bases

    Section 2 Acids and Bases

    Chapter 3

    Bases and Their Properties, continued

    • Bases Have a Bitter Flavor and a Slippery Feel

      • If you have ever tasted soap , you know the bitter taste of a base. It also has the slippery feel of a base.

      • Taste, touch, or smell should NEVERbe used to identify an unknown chemical.

      • Like acids, many bases are corrosive.


    Section 2 acids and bases

    Section 2 Acids and Bases

    Chapter 3

    Bases and Their Properties, continued

    • Bases Change Color in Indicators

      • Like acids, bases change the color of an indicator.

      • Most indicators turn a different color in the presence of bases than they do in the presence of acids.

        • Example:

          • Red litmus paper changes to blue.


    Section 2 acids and bases

    Section 2 Acids and Bases

    Chapter 3

    Bases and Their Properties, continued

    • When a base is added to bromthymol blue, it turns the indicator from pale blue to dark blue.


    Section 2 acids and bases

    Section 2 Acids and Bases

    Chapter 3

    Bases and Their Properties, continued

    • Bases Conduct Electric Current

      • Bases increase the number of hydroxide ions, OH-, in a solution.

      • A hydroxide ion is actually a H atom and an O atom bonded together.

      • The extra electron gives the hydroxide ion a negative charge.


    Section 2 acids and bases

    Section 2 Acids and Bases

    Chapter 3

    Bases and Their Properties, continued

    • Uses of Bases

      • Sodium hydroxide is a base used to make soap, paper, oven cleaners and products that unclog drains.

      • Calcium hydroxide, Ca(OH)2, is used to make cement and plaster.

      • Ammonia is found in many household cleaners and is used to make fertilizers.

      • Magnesium hydroxide and aluminum hydroxide are used in antacids.


  • Login