• Coulometer
• Heating Unit
• Potassium Hydroxide (KOH)
• Silver Nitrate (AgNO3)
• Potassium Iodide (KI)
• Teflon Tape
• Glassware
• Stir bar
• Cathode Solution
• KI Granular
• Anode Solution
• Water Bath
• Safety Gear
• Nitrogen Gas Tank

Fill titration cell:
Cathode Solution goes in large section.
Anode Solution goes in small section.

Add KI Granular to Anode Solution until it covers the bottom of the section - insert stir bar into large section.

Fill KOH, KI, and AgNO3 traps 1/2 full.
The KOH trap is the glass vial with the red cap.
The KI trap is the glass vial with the yellow tint.
The AgNO3 trap is the glass vial with the grayish tint.

Add 2-3 drops of 2N H2SO4 to the KI and AgNO3 traps.

Attach the nitrogen gas tube to the KOH trap.

Turn on nitrogen gas (large silver knob) and increase gas flow (approximately 5 psi) using the blue Increase/Decrease knob on the gas tank regulator.

Set flow control at 100 cc/min on the flow meter on the heating unit.

Connect KOH trap to reaction vial.

KOH traps CO2 out of the gas.

Connect the reaction vial to the thin section of the AgNO3 trap.

AgNO3 traps out H2S.

Connect the top of the AgNO3 trap to the thin section of the KI trap.

KI traps out weak acids.

Connect the top of the KI trap to the titration cell.

This is what the completed set-up should look like.

Teflon tape all joints to avoid leaks.

Turn on the main power to the heating unit.

Turn on the main power to the coulometer.

Turn on the water bath - set at 11 degrees C.

Make sure to open the return valve before opening the source valve.

Rotate the titration cell until maximum transmittance (%T) is attained.

Check the system for bubble transmittance to the titration cell.

Adjust transmittance to 100%.

Never touch the titration cell after this point.

Remove jumper cable and connect titration cell to electrodes:
Red to red
Black to black.

Turn the cell current on and allow the cell current to titrate the cell solution to its endpoint.

The solution color will turn blue when the %T reaches 29.

Reset the coulometer using Reset Button.

Set the timer for 10 minutes.