A student must prepare of an aqueous sodium chloride solution that has a concentration of
CHEMISTRY · Multi-part · AP · Chemistry · Atomic Structure and Properties · Atomic Structure and Properties
Problem
A student must prepare 250.0mL of an aqueous sodium chloride solution that has a concentration of 0.200mol L−1. The laboratory stock contains solid, anhydrous NaCl with a reported purity of 99.8% by mass.
(1) Part 1: (a) Calculate the number of moles of NaCl that must be present in the final solution.
(2) Part 2: (b) Determine the mass of the solid NaCl (to the nearest 0.01g) that the student should weigh, taking the stated purity into account.
(3) Part 3: (c) Describe, in a logically ordered set of steps, how the student should use common laboratory glassware to prepare the solution so that the target concentration is achieved as accurately as possible. Include any volume-adjustment precautions the student should consider after dissolving the salt.