1 / 14

Chapter 9 – Acids and Bases

Chapter 9 – Acids and Bases. BELLWORK Pure vinegar is an acid, called ________ acid. Chapter 9 – Acids and Bases. Key Questions: 1 ] What are the properties of acids? 2] What are the properties of bases?

vahe
Télécharger la présentation

Chapter 9 – 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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chapter 9 – Acids and Bases BELLWORK Pure vinegar is an acid, called ________ acid

  2. Chapter 9 – Acids and Bases • Key Questions: • 1] What are the properties of acids? • 2] What are the properties of bases? • 3] How is pH related to the concentration of hydronium ions and hydroxide ions in solution? • 4] What are some household products that contain acids, bases, and salts?

  3. State Standards • CLE.3202.1.10 – Distinguish among acids, bases, and neutral substances • CLE.3202.Inq.2 – Recognize that science is a progressive endeavor that reevaluates and extends what is already accepted

  4. Key Terms • Acid : Lose an H+ ion when ionized or dissolved in water. Acids are corrosive, taste sour, conduct electricity, and turn indicators different colors - Indicator : Compound that reversibly changes colors depending on pH - Electrolyte : Substance that dissolves in water enabling solution to conduct electricity

  5. Key Terms • Base : Lose OH- when ionized or dissolved in water. Bases have bitter taste, and their solutions feel slippery. These solutions can also conduct electricity, turn indicators colors, and damage skin - pH : Value used to describe the amount of acidity or basicity ( each whole number on a scale from 0-14 indicates a tenfold change in acidity ) - Salt : A compound that has a negative ion and a positive ion bonded together ( NaCl )

  6. Water • H2O  H3O+ +OH- • Balanced? • Dissolves itself to form H3O+ and OH- • Hydronium and Hydroxide

  7. Everyday Acids • Citrus fruits, such as lemons, limes, and oranges, contain citric acid. Apples contain malic acid; grapes contain tartaric acid. • Acids increase amount of H3O+ when added to water (Acids lose H+ ions but water gains them!! )

  8. Everyday Bases • Bases increase amount of OH-when added to water • Bases may lose OH- but not always • As opposed to acids ( how? ) • Common household cleaners ( ammonia based )

  9. Everyday Salts • Salts are not acids & bases ( but similar ) • They both can dissolve when added to water • Common types: • Soap ( salts of Na or K and long hydrocarbon chains • Detergents • Salt ( Duuhh!! )

  10. Indicators • Acids turn Blue Litmus paper Red • Bases turn Red Litmus paper Blue • Demonstration – What happened? • Vinegar • Lemon Juice • Sodium Hydroxide ( NaOH ) • Milk of Magnesia • Tap water

  11. pH • pH values correspond to the amount of hydronium ions

  12. Why It Matters • Normal rain has a pH of about 5.6, so it is slightly acidic. Acid rain is a type of pollution in which the precipitation has a pH that is less than 5.0. Acid rain results from emissions of sulfur dioxide, SO2, and nitric oxide, NO, which are gases from coal-burning power plants and automobiles. The gases react with compounds in the air to form sulfuric acid, H2SO4, and nitric acid, HNO3.

  13. Why It Matters • Acid rain is a type of pollution that can have harmful effects on many parts of the environment, including animals, plants, and buildings • Mercury ingestion – acid rain causes more organic mercury to form in lakes, streams, etc • Organic mercury absorbs more easily in the human body!!

  14. Chapter 9 – Acids and Bases Key Questions: 1] What are the properties of acids? 2] What are the properties of bases? 3] How is pH related to the concentration of hydronium ions and hydroxide ions in solution? 4] What are some household products that contain acids, bases, and salts?

More Related