3 40.0 g of sodium hydroxide was dissolved in 250cm of
water in a volumetric flask. 5.0cm was withdrawn and
diluted to 100cm in another volumetric flask. Finally
20cm was withdrawn from the 100cm flask and diluted to
50cm in a third volumetric flask. The concentration (in
mol/dm ) of sodium hydroxide in the 50cm volumetric
flask is (RAM Na=23; O=16:H=1)
Select one:
a. 0.080
b.0.2
-0.040
d 4.0