Question

You measure out 3.00 mL of 0.100 M Co(NO3)2, place it in the test tube, and add 7.00 mL of water. What is the concentration of Co+2 the diluted solution in the test tube? 

a. 0.0300 M

b. 21.0 M

c. 0.210 M

d. 1.00 M

e. 0.0429 M

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