A chemistry student attempted to make a 0.2000 M solution of NaCl using a 100.0 mL volumetric flask. She added exactly 100.0 mL of water to the flask, then added 0.02000 mol of NaCl, and found that the total volume in the flask was above the 100.0 mL mark. What was the concentration of the solution?
A)exactly 0.2000 M
B)a bit less than 0.2000 M
C)a bit more than 0.2000 M
D)exactly 0.2002 M
E)There is insufficient information to select one of the above responses.

Question

Quizplus · Accepted Answer

Adding the 0.02000 mol of NaCl to 100.0 mL of water will result in a total volume slightly greater than 100.0 mL due to the slight increase in volume caused by the dissolution of the solute. Therefore, the final concentration of NaCl will be slightly less than 0.2000 M.

A Chemistry Student Attempted to Make a 0