LABVIEW

Well, the first thing is to establish the compatibility of materials. Different acids affect materials in different ways, and as the acid in question has been withheld from the original post, this website should prove a useful start.

Good tip! Don't use zinc valves with hydrochloric acid!

Unfortunately, there aren't too many cheap control valves on the market.

A method that may work is to parse out chemicals with pulses, especially if the chemicals are dispensed by gravity and not pressurized, and in that case, I would use containers that have large diameter to height ratio to minimize rapid variations in head.

LabVIEW has the capability to time a digital output down to milliseconds, so a little experimentation with liquids of similar viscosity should tell you the resolution you can expect.

Send mo' info, please.

If it is a student project for University (ie- not for an actual company) then you don't need anything fancy. Look at valve manufacturer website data and the internet to decide what type of valve is going to be suitable for your application and buy a second-hand valve of the internet or from a local second-hand perts dealer.

If the project is purely a demonstration project (ie- acid is simulated with coloured water) then you don't actually need a valve suitable for acid, which will make finding a cheap second-hand valve easier (but you need to make sure your documentation includes the correct valve for project accuracy).