Question

A 30.7 mL, 1.66 M KMnO4 solution is mixed with 16.7 mL of 0.704 M KMnO4 solution. Calculate the concentration of the final solution.

Answer 1

Ma = 1.66 M

Va = 30.7 mL

Mb = 0.704 M

Vb = 16.7 mL

Using the law of dilution :

Mf = Ma x Va + Mb x Vb / Va + Vb

Mf = 1.66 x 30.7 +  0.704 x 16.7 / 30.7 + 16.7

Mf = 50.962 + 11.7568 / 47.4

Mf = 62.7188 / 47.4

Mf = 1.323 M

hope this helps!