A good first step would be to simply sort the inputs in to different pipelines.
The carbon from the CO2 needs to be stripped out and send to the output. That might be a good opportunity to do something clever.
Like putting a sulfur atom in there and double bonding those oxygens on to it. In fact, rotate it nintey degrees and do it twice. Sulfur has a maximum bond count of six so the bonding should work out to form something very close to the acid, only missing hydrogen.
To get this to work, the hydrogen sulfide will need to be unbonded and send in to a sulfur pipeline and a hydrogen pipeline.
A few things to note. Both waldos call Bond+ simultaneously to create the double bond. The red waldo uses a sensor to detect when it has bonded twice.
All that remains is to bond the hydrogens on. Once again, rotation and sensing can control this.
This will create the acid.