What volume of concentrated hcl (12.1m) is necessary to make a 0.250m hcl solution in a 5l volume?

By using the following formula we can calculate the volume;
C1V1 = C2V2
let V1 is the volume we have to find, then
C1 = 12.1m
C2 = 0.250m
V2 = 5 l
Now, C1V1 = C2V2
12.1 x V1 = 0.250 x 5
V1 = 1.25 / 12.1 
V1 = 0.1033 l
thus, the 0.1033 liter of HCl is necessary.

Answer (b) supersaturation;

The answer is c.  h+  and oh−  react to form water (h2o). i just took the test and i got it right. hope this !