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Unformatted text preview: patino (mp25752) Pre-lab 4 Lyon (53385) 1 This print-out should have 5 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 2.0 points Calculate the molecular weight of KHP. The molecular formula of KHP is C 8 H 5 O 4 K. What does the abbreviation KHP stand for? 1. MW = 204.223 grams/mole. KHP stands for potassium hydrogen phthalate. correct 2. MW = 71.080. KHP stands for potassium hydrogen phosphate. 3. MW = 71.080 grams/mole. KHP stands for potassium hydrogen phthalate. 4. MW = 180.1572. KHP stands for potas- sium hydroxy phosphate. 5. MW = 204.223 grams/mole. KHP stands for potassium hydrogen phosphorus. 6. MW = 71.080 grams/mole. KHP stands for potassium, hydrogen, and phosphorus. Explanation: The chemical formula is given in the ques- tion. 002 2.0 points What is the main objective of Part 1 of the experimental procedure? What is the purpose of using KHP in this part of the experiment? 1. The main objective of Part 1 is to con- dition the phenolphthalein before using it in Part 2. KHP is used in Part 1 because the phthalate in potassium hydrogen phthalate reacts with the phthalein in phenolphthalein to create the pink color that we will need for the unknown acid titration in Part 2. 2. The main objective of Part 1 is to make sure all the students are paying attention to standard laboratory safety practices be- fore they receive a vial of acid to work with. KHP is used in Part 1 because it poses no health hazard to students who dont know what theyre doing....
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This note was uploaded on 10/21/2009 for the course CH 53395 taught by Professor Lyon during the Spring '09 term at University of Texas at Austin.
- Spring '09