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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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- Spring '08