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Pre-lab 4-solutions - gonzales(pag757 Pre-lab 4 Lyon(52635...

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gonzales (pag757) – Pre-lab 4 – Lyon – (52635) 1 This print-out should have 5 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. Now that you have become familiar with the due dates of your lab assignments, there will be no more reminders in the heading of your assignments. 001 10.0 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 = 180.1572. KHP stands for potas- sium hydroxy phosphate. 2. MW = 204.223 grams/mole. KHP stands for potassium hydrogen phosphorus. 3. MW = 204.223 grams/mole. KHP stands for potassium hydrogen phthalate. correct 4. MW = 71.080 grams/mole. KHP stands for potassium hydrogen phthalate. 5. MW = 71.080 grams/mole. KHP stands for potassium, hydrogen, and phosphorus. 6. MW = 71.080. KHP stands for potassium hydrogen phosphate. Explanation: The chemical formula is given in the ques- tion. 002 10.0 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 purpose of Part 1 is to gain practice doing titrations before we titrate our unknown acid in Part 2. KHP is used in Part 1 because we don’t want to use up our unknown acid during the practice titrations, and KHP is an inexpensive alternative to a real acid. 2. The main objective Part 1 is to determine the purity of the NaOH solution. We can determine the percent purity of the NaOH solution by taking a mole ratio of NaOH to KHP. 3. 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.
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