If you have a 1255ml of a 10.55 M solution of HCl and you need to dilute the solution to 1.555 M solution; How much solvent must you add?
you want to dilute it (10.55/1.555 = 6.78 times, which means one part stock, and 5.78 parts water.
one part=1255ml
five parts=onepart*5
mix, (always add acid to water), stir, label.