1 / 12

Acids, Bases, and pH

Acids, Bases, and pH. Physical Science Chapter 9.2. Properties of Acids. Create a sour taste in foods (lemons) React with metals to produce hydrogen gas (H 2 ) Change color of blue litmus paper to red Can be very corrosive, destroying metals and burning skin through chemical reactions.

fnoyes
Download Presentation

Acids, Bases, and pH

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. Acids, Bases, and pH Physical Science Chapter 9.2

  2. Properties of Acids • Create a sour taste in foods (lemons) • React with metals to produce hydrogen gas (H2) • Change color of blue litmus paper to red • Can be very corrosive, destroying metals and burning skin through chemical reactions

  3. Acids Make Hydronium Ions • Acids make hydronium ions when dissolved in water • Hydronium ions (H3O+)

  4. Properties of Bases • Create a bitter taste • Have a slippery feel, like soap • Change the color of red litmus paper to blue • Can be very corrosive, destroying metals and burning skin through a chemical reaction

  5. Bases Produce Hydroxide Ions • Bases produce hydroxide ions when dissolved in water • Hydroxide ions (OH-) • aka Alkaline

  6. Strength of Acids and Bases • Strong Base • Sodium Hydroxide (NaOH) • Dissociates completely to NA+ and OH- • Weak Base • Ammonia (NH3) • Only a few molecules react to form NH4+ and OH- • Strong Acid • Hydrochloric Acid (HCl) • Completely dissolves into H+ ions • Weak Acid • Acetic Acid (HC2H3O2) • Only as small percentage break apart into H+ ions

  7. Water • A Weak Base • In presence of base, it acts as an acid • A Weak Acid • In presence of acid, it acts as a base

  8. pH • Potential for Hydrogen • pH scale 0-14 • <7 is acid • 0 is strong acid • >7 base • 14 is strong base • 7 is neutral

  9. pH Indicators • Chemicals that turn different colors when exposed to acids or bases. • Red cabbage juice • Litmus paper • Made from lichens • Blue turns red with acids • Red turns blue with bases • pH paper • Tests both acids and bases

  10. pH and the Environment • Plants require specific range of pH, 5-7 • Some plants change color based on pH, hydrangea • Blue in acid soil • Cream in neutral soil • Pink/purple in alkaline soil • Ponds, etc. range of 6-8 • Most fish tolerate 5-9 • Most amphibians tolerate 6-8

  11. Acids, Bases, and You • Stomach acid (pH 1.4) protected by mucus lining • Ulcer, heartburn • Blood pH 7.3-7.5 • Too much CO2 makes blood acidic, regulate CO2 level by automatic breathing changes

  12. Neutralization Reaction • When you mix an acid and a base, they neutralize each other, making water and a salt • Sodium bicarbonate and an upset stomach

More Related