chemistry
posted by Hiba .
How many liters of water must be added to 4 liters of a 6 molar HNO3 solution to create a solution that is 2 molar?

mL x M = mL x M
(Note: the final volume will NOT be the number of mL that must be added.) 
So will it be 0.004*6=2(mL)
0.024/2=mL
0.012mL ? 
You think 4 L = 0.004 mL? Think again, once to get the correct volume, then a second time after you have reread my note.

Sorry i got confused so it is 4000 mL. So will the final volume be the L that is added?

No, the final volume will be the final volume. You STARTED with 4000 mL and the final volume is xxx; therefore, xxx  4000 will be the mL that must be added.
Technically, that isn't exactly right because the volumes usually are not additive but I think the intent of this problem is to assume the volumes ARE additive.