stock concentration

Question

If your stock solution has a concentration of 0.75 M and you want to make 250 mL of a solution that has a concentration of 4.8×10^-2 M, how much stock solution will you need in ml?

Answer 1

Use V1M1 = V2M2

V1 = initial volume = ?

M1 = initial molarity = 0.75 M

V2 = final volume 2 = 250 ml

M2 = final volarity = 4.8x10^-2 M

(V1)(0.75 M) = (250 ml)(4.8x10^-2 M)

V1 = 16 mls of stock is needed