Solution: A 4.691 g sample of MgCl2 is dissolved in enough water to give 750 mL of solution.  What is the magnesium ion concentration in this solution? A)  3.70 x 10–2 M              B)  1.05 x 10–2 M        

A 4.691 g sample of MgCl₂ is dissolved in enough water to give 750 mL of solution.  What is the magnesium ion concentration in this solution?

A)  3.70 x 10^–2 M             

B)  1.05 x 10^–2 M             

C)  6.57 x 10^–2 M              

D)  4.93 x 10^–2 M             

E)  0.131 M