What is the molarity of the solutions prepared by diluting 25.0 mL of 0.31 M `MgCl_2` solution to each of the following volumes (a) 40 mL (b) 100 mL © 350 mL?

Explanation

Given `V_1 =25 mL " " v_2 =40mL `
` M_1 =0.312M " "M_2 = ? `
` V_1 M_1 =V_2M_2 `
` 250xx 0.312 = 40 xx M_2 `
` M_2 =( 25xx 0.312)/( 40) `
` M_2 =0.195M`
Given ` V_1 =25 mL " "V_2 =100 mL `
` M_1 =0.312 m" "M_2 = ?`
` V_1M_1 =V_2M_2`
` 250xx 0.312 = 100xx M_2`
` M_2 =( 25xx 0.312)/( 40) `
` M_2 = 0.078M`
(c) Given ` V_1 =25mL " "V_2 350mL `
` M_1 =0.312 m " "M_2? `
` V_1 M_1 =V_2M_2`
` M_2 =( 25xx 0.312) /( 350) =0.022M`