Custom chemical injector

I need a custom venturi type chemical injector that will work with my water pump. The pump produces around 100 psi of pressure at 4 or 5 gpm. I need it to siphon around a 5:1 ratio of acid from a bucket. 5 parts water to 1 part acid, while maintaining a 4 or 5 gpm of flow through the injector. After leaving the injector it will go through a 45' long pipe that is around 3/4" in diameter. Once going through the pipe it will exit out of a .141" opening. Some of the variables can change if needed but the .141" opening at the end of the pipe has to stay the same.