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Warmup 1/31/12

Warmup 1/31/12. Write a story about a strong acid being spilled. Objective Tonight’s Homework. To learn how we measure the relative strength of different acids. pp 583: 14. What does acid actually do?. Which of these are real? Just how powerful is acid?. Strengths and Effects of Acids.

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Warmup 1/31/12

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  1. Warmup 1/31/12 Write a story about a strong acid being spilled Objective Tonight’s Homework To learn how we measure the relative strength of different acids pp 583: 14

  2. What does acid actually do? Which of these are real? Just how powerful is acid?

  3. Strengths and Effects of Acids Some acids are stronger than others. So what does it mean when we say “strong acid”? What it means is that the hydrogen will more easily detach from the acid and attach to something else instead. At a later point, we’ll discuss how to measure this sort of thing, but for now, let’s just get a basic list of acidity of things around us:

  4. Strengths and Effects of Acids In the list below, each acid is 10xstronger than the one below it. Each base is 10xstronger than the one above it.

  5. Strengths and Effects of Acids We can take the acidic side fartherinto what areknown as “superacids”. If battery acidis at the bottomof the list, we canextend it to include superacids. Note that the strongest is 1018times stronger thanbattery acid!

  6. Strengths and Effects of Acids We can do this with bases, too, to get “superbases”. However, these are much harder to classify as they react violently and corrosively with water, carbon dioxide, or oxygen. So… everything in air or water.

  7. Strengths and Effects of Acids Our next piece is one never addressed in textbooks, but one that should be. What does acid do when it touches skin? How does it burn?

  8. Strengths and Effects of Acids Our next piece is one never addressed in textbooks, but one that should be. What does acid do when it touches skin? How does it burn? Acid does what’s called a “chemical burn”. This damages the skin in a way very different from fire. To understand, we need to first discuss something called “esters”.

  9. Strengths and Effects of Acids Esters are complex organic compounds in your body. In everyday life, they’re found in everything from fragrances and alcohols to explosives and plastics.

  10. Strengths and Effects of Acids Esters are complex organic compounds in your body. In everyday life, they’re found in everything from fragrances and alcohols to explosives and plastics. Part of every ester has an oxygen attached to a carbon. When acid comes in contact with an ester, it can rip the oxygen off, forming a broken ester and OH-. That OH- can then combine to other things, doing more damage. This ripping is what causes a chemical burn and is what acid does to the body.

  11. Strengths and Effects of Acids Let’s watch a few quick videos showing what strong acids can do.

  12. Exit Question #12 Look on page 584 of your book. Which acid below is the strongest? a) Hydrofluoric Acid b) Hydroselenic Acid c) Phosphoric Acid d) Hydrochloric Acid e) Sulfuric Acid f) None of the above

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