You have a stock solution of 15.8 M NH3 . How many milliliters of this solution should you dilute to make 1350 mL of 0.300 M NH3

2 answers

you want to dilute it 15.8/.3 times, or 52.6666 times.

this means one part stock, 51.66666 parts water.

so what is a part? 1350/52.66666=25.6 ml

so you take 25.6ml of stock solution, then add 1350-25.6 ml water stir, label, and properly store.
1375.6