Dear Student,

The solution is as follows:

Since we have been told to find the total Mg2+ concentration in the solution and not the one which is in equilibrium with MgF2 , it will be the total concentration of Mg2+ in the solution, which is:

Total volume = 10 + 25 = 35 mlGiven: Initial Mg2+=0.25 M, Initial volume = 10 mlInitial F- = 0.2 M , initial volume = 35 mlMg2+=10 ml35 ml×0.25 M=7.14 ×10-2 MF-=25 ml35 mlx0.2 M=14 x 10-2 M 
Thus, the correct answer is option (b).

Hope it helps.


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