lab 2 prelab and postlab answers

lab 2 prelab and postlab answers - When you find the log of...

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Course Instructor: Dr. S. Berniolles Page 1 CHEM 6BL EXPERIMENT 2 ANSWER KEY PRELAB & POSTLAB QUESTIONS PRELABORATORY QUESTIONS 1. See criteria in lab manual introduction 2. See lab manual/lecture notes 3. Dissolve 1.00 g of NaOH in (<250 mL) water, and then add water to the calibration mark in a 250-mL volumetric flask 4. Standardization performed in Part II 5. Carbon dioxide from the air dissolves in water (see equations in lecture notes) to produce H 3 O + ions which induce a concentration stress on the indicator acid-base equilibrium 6. K a = 5.6 10 -10 (Note: 2 sig. figs. due to the rule* for sig. figs. on logs and exponentials) * Important Reminder on sig. fig. rules for Logarithms and Exponentials:
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Unformatted text preview: When you find the log of a number, the number of significant figures of that number is the number of decimal places of the answer (e.g., log 2.45 = 0.389). When you find the antilogarithm of a number, the number of decimal places of that number in NONEXPONENTIAL FORM is the number of significant figures of the answer (e.g., 10 3.2 x 10-2 = 10 0.032 = 1.08 or another example 10 0.389 = 2.45 ). 7. See MSDS Information POSTLABORATORY QUESTIONS 1. 0.489 L 2. 112.0 g/mol 3. 2.072 g 4. 2.7 10-8 M 5. 4.721 6. 1.4 10-5 7. 3.0 M...
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This note was uploaded on 07/24/2010 for the course CHEM CHEM 6BL taught by Professor Berniolles during the Summer '08 term at UCSD.

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