You need to make 40.00 ml of a 0.045M NaOH solution from a 2.1M stock solution. How many ml of the stock solution are needed?
mL1 x M1 = mL2 x M2
40 x 0.045 = mL2 x 2.1
Solve for mL2 of the stock to take.
40 x 0.045 = mL2 x 2.1
Solve for mL2 of the stock to take.