analytical HW 1

# analytical HW 1 - o to 25 o C If a 0.50 M solution is...

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Chem 523 Homework 1 (Total 10 pts) Due on 09/06/11 (Data for calculations can be found in lecture notes or in your text) 1. What is the difference between qualitative and quantitative analysis? (2 pts) 2. List the steps in a chemical analysis? (4 pts) 3. Define homogeneous and heterogeneous samples (2 pts) 4. When it is preferable to use a plastic volumetric flask instead of more accurate glass flask? (2 pt) 5. Which is more accurate, a transfer pipet or a measuring pipet? (2 pt) 6. How do you know when to replace the desiccants? (2 pts) 7. Water from a 5-mL pipet was drained into a weighing bottle whose empty mass was 9.974 g to give a new mass of 14.974 g at 26° C. Find the volume of the pipet at 26° C and at 20° C. (4 pts) 8. By what percentage does a dilute aqueous solution expand when heated from 15
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Unformatted text preview: o to 25 o C? If a 0.50 M solution is prepared at 15 o C, what would its molarity be at 25 o C? (4 pts) 9. The true volume of a 50 mL volumetric flask is 50.037 mL at 20 o C. What mass of water measured (a) in vacuum and (b) in air at 20 o C would be contained in the flask? (4 pts) 10. Potassium hydrogen phthalate (KHP) is a primary standard used to measure the concentration of NaOH solutions (KHP: NaOH stoichiometry 1:1). Find the true mass of potassium hydrogen phthalate (density = 1.636 g/mL) if the apparent mass weighed in air is 4.2366 g. If you did not correct the mass for buoyancy, would the calculated molarity of NaOH be too high or too low? (4 pts)...
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