IF you have 5.5 gallons plugged into the water tool, then yes. Realize that when you apply this to a recipe, it will adjust the minerals based upon the actual water usage (including the grain absorption), so the salt addition amounts will adjust to maintain the same ion balance as in the water profile.
Edit: I should have asked if 5.5 gallons was the "total water needed" or your batch size? You really want to base the water profile on the total water needed or, if you are just using the salts to adjust your mash pH, your mash water requirement.