A Set of Five Solutions Are Prepared by Delivering 10

Multiple Choice

A set of five solutions are prepared by delivering 10 mL of unknown sample and increasing volumes of standard (0,5,10,15,and 20 mL) into 50-mL volumetric flasks.Analytical reagents are then added and diluted to volume.The x-intercept is −3.90 mM.What is the unknown concentration?

A) 39.0 mM
B) 156 mM
C) 19.5 mM
D) 0) 390 mM
E) 195 mM