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Chemistry 16 May 2011

Honors Reviewing the problem solving strategy Practice with quantitative gas chemistry Wednesday: Intro to solution chemistry. AP Report writing - Titration labs Research and problem formulation - electrochemical cells and electrolysis. Chemistry 16 May 2011. Chemistry 16 May 2011.

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Chemistry 16 May 2011

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  1. Honors Reviewing the problem solving strategy Practice with quantitative gas chemistry Wednesday: Intro to solution chemistry AP Report writing - Titration labs Research and problem formulation - electrochemical cells and electrolysis Chemistry 16 May 2011

  2. Chemistry 16 May 2011 • Reviewing the problem solving strategy • Practice with quantitative gas chemistry • Wednesday: Intro to solution chemistry

  3. The problem solving approach • 1. Identify what you are looking for • 2. State your variables • 3. List any equations you are going to use • 4. Rearrange the equation to solve for the unknown • 5. Plug in and solve • 6. Check answer - use units as a guide

  4. Lets try it… • A student draws in a very deep breath. She blows this into a balloon. • The volume of the balloon is 0.5 L after this. If the temperature is 298 K, and we assume the pressure in the balloon is 1 atm, how many moles of gas did the student breathe out? • R = 0.082 Latm/molK

  5. Honors Quantitative Solution Chemistry AP Electrochemistry lab - develop lab plan -be ready to start on Monday If you need anything, I need to know today Chemistry 20 May 2011

  6. Chemistry 20 May 2011 • Quantitative Solution Chemistry • Question: If you and your friend make sugar water, will your solutions always be the same?

  7. Making solutions • A solution of specific concentration and volume is made by adding solute to solvent • M = mol/vol • For example: How would you make 100 ml of a 0.5 M solution of NaCl?

  8. Making dilutions

  9. Making dilutions • Very dilute solutions are difficult to make accurately because it is hard to weigh small amounts of solute • So, we make more concentrated solutions and then dilute them. • M1V1 = M2V2 • The trick is to solve for V1 which is the amount of the stock you need

  10. Dilution example • How can you make 100 ml of 0.025 M NaCl if you have the 0.5 M NaCl “stock solution” from the last problem?

  11. You try • How would you make 500 ml of 1 M MgCl2? • How would you make 250 ml of 0.01 M MgCl2 using the stock from part 1?

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