You perform a serial dilution of a 5 M NaCl solution:
First dilution- pipette 10mL of 5 M NaCl into 99 mL of water.
Second dilution- pipette 1 mL of the first dilution into 99mL of water.
Third dilution- pipette 100 ul of second dilution into 99 mL of water.
What is the concentration of NaCl after the third dilution? _______ uM