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# Thermal Dependency DRAFT

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Thermal Dependency DRAFT
Volumetric Instruments
Filtration & Evaporation
###### Thermal Expansion

Concept #1: Temperature can have an adverse effect on determing the true mass or volume of a solution.

Example #1: Massachusetts limits the amount of lead in drinking water to 219 ppb. a) Express this total in molarity. b) What will happen to the molarity of the solution as the temperature increases: will it increase, decrease or remain constant?

###### Thermal Expansion Calculations

Example #2: If a 0.02135 M aqueous solution is prepared at 21oC (d = 0.9979955 g/mL) what is the new concentration if the same experiment is performed a month later when the temperature is now 26 oC (d = 0.9967867 g/mL)?

Practice: The mass of an empty container at 28 oC is 83.93 g. The mass of the container when filled with water from a 25-mL pipet is 108.70 g. Calculate the true volume of delivered water by the calibrated pipet.