I think you mean boric acid and by all means do NOT put it anywhere near a cat's eyes, as you could damage them.
Just a very few slivers in warm water makes an excellent eyewash (old remedy from my grandma).
how much green coffee been powder should i boil per serving
8 cups
yes you should use baking powder in scones because that makes the scones rise when they bake.
15-20 pounds or less.
It depends on what you want to do with it. You should consult a reloading guide.
2 grams
Depends what powder
I don't really know but it should be expensive
Depends on which powder, and which loading of the 9mm.
2 miles from your eyes.
To do what?