Tennessee SPI Objective: Identify the basic properties of acids… Check for Understanding Determine whether a substance is an acid or a base by its reaction to an indicator. Essential Question(s) 1) What are the basic properties of acids? 2) How do I interpret the pH scale? 3) How can I use indicators to determine if a substance is an acid? Notes SPI Acids and Bases Date Instructions for Students 1) Make sure you view this presentation in slideshow mode. 2) You can find instructions about how to do this by doing a Google search or by searching YouTube. 3) After you have it in slideshow mode, press the right-arrow keyboard button to advance through the presentation. 4) If you need help, please communicate with your teacher.

Acid Properties  An acid is any compound that increases the number of positive hydronium ions when dissolved in water.  Acids have a sour flavor The sour taste of lemons, limes, and other citrus fruits is a result of citric acid.  Acids neutralize bases and bases neutralize acids  Acids conduct electricity and are used in batteries Notes SPI Acids and Bases Acids

 Acids are found in foods you like such as oranges, soft drinks, and tomatoes (think pizza and spaghetti).  So think of acids with hydroniYUM because acids go with hydronium ions. Notes SPI Acids and Bases Acids Memory Trick Acids and Hydronium

 Acids Change Colors in Indicators When acid is added, the color changes to yellow. This flask contains bromothymol blue. Examples of Indicators: litmus paper phenolphthalein cabbage juice bromothymol blue

Litmus paper- is a common acid/base indicator blue litmus paper turns red in acids

Fill in the blanks using the following words… red, hydronium, acids, compound, sour  An acid is any ____________that increases the number of _____________ions.  Acids have a _______ flavor.  _________ neutralize bases.  Blue litmus paper turns ______ in acids. compound Review Questions hydronium sour Acids red SPI Acids and Bases Acids

Acid Properties-Continued Acids react with some metals Acids react with some metals to produce hydrogen gas. Acids conduct electric current Example: found in flashlight batteries and/or car batteries Example: hydrochloric acid with zinc metal Notes SPI Acids and Bases Acids

Fill in the blanks using the following words ions, electricity, metals  Acids react with some ________.  _____ are formed during chemical reactions when electrons are lost or gained  Acids conduct ___________. Review Questions metals ions electricity BONUS QUESTION How is an ion different from an atom? SPI Acids and Bases  Ions are positive or negative, but atoms have no charge. Acids  Otherwise, atoms and ions look nearly identical

 pH scale: measures acidity or basicity (A.K.A. Alkalinity). (tells you how strong or weak acids and bases are)  Acids are 0 to 6.9 on the pH scale  7 is neutral (pure water is 7) 9 Acids are 0 to 6.9 The pH scale (pH=power or potential of hydrogen)

 Again…acids are 0 to 6.9 on the pH scale  The lower the number…the stronger the acid  In other words, an acid with a pH of 1 is stronger than an acid with a pH of 5 10 pH 1 is stronger than pH 5 More About the pH scale

 Reminder: The pH scale can be displayed different ways.  Yet the ranges for acids and bases stays the same (0 to 6.9 for acids, 7.1 to 14 for bases) 11 pH Scale

Fill in the blanks using the following words 0 to 6.9, True, seven, vinegar, pH scale  A __________ tells you how strong or weak an acid or base is.  On a pH scale, the range for acids is ________.  neutral substances have a pH of ________?  (True or False): An acid with a pH of 2 is stronger than an acid with a pH of 4. ___________.  Which substance has greater acidity, pure water or vinegar? __________. Review Questions seven 0 to 6.9 pH scale True vinegar SPI Acids and Bases Acids

F.Y.I.---How are acids used?  Sulfuric acid is (most common) used to make paper, paint, detergents, fertilizers and many other products like batteries  Nitric acid is used to make fertilizers, rubber, and plastics.  Hydrochloric acid is used to separate metal from their ores. It is also used in swimming pools and in your stomach.  Citric acid and ascorbic acid (Vitamin C) are found in orange juice, grapefruit juice, and tomatoes.  Carbonic acid and phosphoric acid are in soft drinks. Notes SPI Acids and Bases Acids

Link 01:Universal IndicatorUniversal Indicator Link 02:Coke can in acidCoke can in acid Link 03:Cheeseburger in Hydrochloric AcidCheeseburger in Hydrochloric Acid Video Links SPI Acids and Bases Science