Answer:
it's a 1/2 teaspoon
because theres 500mg/5ml
theres 5ml in 1 teaspoon. since he only need 250 mg. he needs 1/2 teaspoon
"When water molecules escape from your frozen food, it is also possible for oxygen molecules to seep in. The oxygen molecules can dull the color and modify the flavor of your frozen product. Food that has freezer burn is safe to eat, but you may find the texture and taste not to your liking."
Source - https://www.loc.gov/rr/scitech/mysteries/freezerburn.html