Announcements Note if you are interested the site to turn...

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10/1/17 1 Announcements Note: if you are interested, the site to turn in the paper rough draft is now active. Smartwork homework due dates: Chapter 4 is due TODAY Remember, you don’t need to get 100% on Smartwork to get full homework points in this class. Chapter 5 – Part 1 is due on October 9 Wrapping up Chapter 4 We have been building a LOT of pieces within the idea of water chemistry in Chapter 4. How do these pieces fit together to understand water quality issues? Pieces - 1 Water is a good solvent (universal solvent) We express amounts with concentration Ratio of solute (numerator) and whole (solvent or solution –denominator) Different units abound for concentration We can manipulate concentration with dillution
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10/1/17 2 Pieces - 2 One way that we come into contact with potentially dangerous substances is via solutions so we need to know something about toxicity We can measure concentration with instruments (absorbance) or titration Pieces - 3 We have several things about water chemistry that we can characterize Electrolyte – vs – non-electrolyte When ionic substances dissolve they form ions in the aqueous solution. Some substances dissolve less than fully and are called weak electrolytes. Pieces - 4 Acids and bases can be defined in several ways (s0 far, Arrhenius and Bronsted) Strong versus weak is NOT the same as concentrated versus dilute You can have a dilute strong acid, for example. When an acid reacts with a base it is called neutralization
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10/1/17 3 Pieces - 5 When two different electrolyte solutions are mixed, a solid precipitate may form We need to know some facts about solubility to predict this.
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