1 / 11

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.

sunee
Download Presentation

Chemistry 16 May 2011

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. 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?

More Related