How much water?

Question

How much distilled water must be added to 0.5 mL of 0.1 M FeCl₃ to make it 0.001 M FeCl₃ (in units of mL)?

Answer 1

M1V1=M2V2 dilution formula

0.1M x 0.5 mL = 0.001 M x V2

V2 = 50 mL

The volume of water to be added is 50 mL -0.5 mL = 49.5 mL