🔍 Key Concepts

• Boiler water chemistry and why treatment chemicals are added • The purpose of sulfite compounds in a boiler system • The relationship between oxygen, corrosion, and common boiler water tests

💭 Think About

• Ask yourself: What job does sodium sulfite usually perform in a boiler system—does it control pH, hardness, oxygen, or something else? • Think about which test would be used if an engineer wanted to know whether the boiler water would cause scale versus rust. • Which of the choices directly matches the known function of sulfite in preventing a specific boiler problem?

✅ Before You Answer

• Identify the primary purpose of sodium sulfite in boiler water treatment. • Match that purpose to the most directly related test outcome in the answer choices. • Make sure you do NOT confuse pH control, hardness control, and oxygen removal—each has its own typical chemicals and tests.