In my experience the best way is to state your justifications for having a raise. Usually this can be an increased amount of work or responsibilities. I would be hesitant to ask for a raise for dedication in today’s economy unless your skills were highly valued and you could easily get a similarly or higher paying job elsewhere.
And again, unless you have a good pulse on your salary conditions in your town/job field, I would not make a monetary request, I would evaluate what they propose and decide if that was acceptable or not.