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Podcast 12.5 pH and pOH

Dive into the world of acids and bases with this comprehensive podcast exploring pH, pOH, acid-base reactions, and calculations. Learn about the characteristics of acids and bases, their reactions, and how to use the pH scale effectively. Discover the importance of neutral solutions, pH indicators, and how to calculate pH and pOH. Enhance your knowledge of acid-base chemistry through practical examples and explanations in an easy-to-follow format.

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Podcast 12.5 pH and pOH

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  1. Podcast 12.5pH and pOH

  2. Acids • Taste sour • Give a sharp stinging pain in a cut • Reacts with metals • Called a proton donor • Have a high concentration of H+ ions • Range from 0-6.9 on pH scale • 0 = strongest acid • 6.9 = weakest acid

  3. Bases • Taste bitter • Feels slippery (soap) • Can dissolve organic matter • Called a proton acceptor • Have a high concentration of OH- ions • Range from 7.1-14 on pH scale • 14 = strongest base • 7.1 = weakest base

  4. Acid – Base Reactions If you mix an acid with a base, it will either form water or neutralize. Reaction: H+ + OH- H2O

  5. pH Ranges of Acid-Base Indicators

  6. Acid Base Calculations • In neutral solutions, [H+] and [OH-] are ______________ • In water, [H+] = [OH-] = 1 x 10-7 M • For other solutions, when [H+] increases, then [OH-] will decrease and vise versa

  7. Using the pH Scale • pH: Power of Hydrogen • pH = 7 Neutral [H+] = 1 x 10-7 • pH < 7 Acidic [H] > 1 x 10-7 • pH > 7 Basic [H+] = 1 x 10-7 • pH = _______[H+] • pOH : Power of Hydroxide • pOH = -log [OH-] • pH + pOH = 14

  8. Using pH Scale Example 1: Calculate pH if [H+] = 1 x 10-7 M

  9. Example 2: Complete the following chart

  10. Example 3 – Incomplete Dissociation What is the pHof a weak acid that is 8% dissociated as 0.100 M solution?

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