In addition to the repeated use of surface...

In addition to the repeated use of surface...

Question 1 of 270705eccefa0bacbc34ba4d46f92

In addition to the repeated use of surface blow to control boiler water chemistry, caustic soda may be used to treat high salinity, as well as __________.

Question 1 of 27070

Q

In addition to the repeated use of surface blow to control boiler water chemistry, caustic soda may be used to treat high salinity, as well as __________.

🔍 Key Concepts

• Boiler water chemistry: purpose of caustic soda (NaOH) in marine boilers • Relationship between alkalinity, scale formation, and corrosion • How different boiler treatments (phosphate, chromate, etc.) are typically used

💭 Think About

• What specific water-chemistry condition (besides high salinity) is directly improved by increasing alkalinity with caustic soda? • Which listed chemicals are commonly associated with scale prevention versus oxygen control versus priming? • Think about what happens to hardness salts (like calcium compounds) when caustic soda is added—do they stay dissolved, or form precipitates that can be removed?

✅ Before You Answer

• Identify which choice pairs caustic soda with a function that matches its main role: raising alkalinity and helping precipitate hardness. • Eliminate any answers where the second chemical is actually the primary treatment for that function (e.g., main oxygen scavenger or main phosphate treatment). • Make sure the treatment you pick logically connects: caustic soda + that condition should reduce scale/corrosion risk, not increase it.