A professional who operates equipment to control chemical reaction of soda ash and milk of lime to make caustic soda. Respnsibilities include:

• Opens valves and starts pumps to fill dissolving tank with specified amounts of soda ash and milk of lime.
• Starts mixer in tank to agitate materials and dissolve solids.
• Draws sample of mixture from tank and measures its gravity with hydrometer.
• Opens water valve to dilute mixture and obtain specified concentrations according to type of product.
• Turns valves and rheostats to adjust feeding of solution to reactor tank.
• Periodically takes samples of reacting liquor and titrates samples with normal acid to determine concentration of caustic soda being formed.
• Conducts similar tests and titrations to determine salt content and concentration of various liquors.
• Clears stopped pipelines and repairs equipment, using handtools.