Question

The molarity of a solution obtained by mixing 750 mL of 0.5(M) HCl with 250 mL of 2(M) HCl will be : (a) 0.875 M (b) 1.00 M(c) 1.75 M (d) 0.975 M

Answer 1

For mixing two solutions of the same substance,

M1V1 + M2V2= M3(V1+V2)

So, 0.75*0.5+0.25*2=M3(1)

M3=0.875.