To what volume should you dilute 48mL of a 13M stock HNO3

Question

solution to obtain a 0.122 HNO3
solution?

Answer 1

you want to dilute it 13/.122 times, or 106.6times.
That means 1 part acid, 105.5 parts water.

so if one part is 48ml, then you add that much conc acid to 5.07liters of water.