Question

From Le Chatlier's Principle Equilibrium Lab

Fill a second cuvette about ¾ full with 0.10 M Co(NO3)2 .6H2O.

Prepare 100 mL of a 0.010 M Co(NO3)2 . 6H2O solution. Add exactly 10.0 mL of 0.10 M Co(NO3)2 .6H2O to a 100 mL volumetric flask and dilute with deionized water to the mark.

5. Use the 10.0 ml graduated cylinder to prepare a solution of [C oCl4]2-. To the 10 mL graduated cylinder add 1.0 mL of 0.010 M Co(NO3)2 * 6H2O (prepared in step 4). Carefully pipette 4.0 mL of 12 M HCl into the graduated cylinder so that the total volume is 5 mL.

With this information, I have to calculate the concentration of Co(NO3)2. 6 H2O and do not know how. Thank you.