Phenolphthalein indicator is used in the...

🔍 Key Concepts

• Boiler water treatment and why different tests are done (oxygen, hardness, chlorides, alkalinity) • What a phenolphthalein indicator shows in chemistry (think about pH ranges and acidity vs alkalinity) • Which boiler water properties are usually checked using titration with an indicator rather than meters or special reagents

💭 Think About

• Ask yourself: In basic chemistry lab work, what type of measurement commonly uses phenolphthalein as the color-change indicator? • Think about which of the listed choices is most directly related to pH or degrees of basicity/causticity. • Consider which parameters (oxygen, chlorides, hardness, alkalinity) are often checked using other specific reagents or test kits instead of phenolphthalein.

✅ Before You Answer

• Review what property phenolphthalein responds to: acid vs base (and the pH range). • Match that property to the boiler water characteristic that is about excess caustic/basic condition. • Eliminate any options that are usually tested with special oxidizing/reducing reagents or precipitation methods rather than simple acid–base titration.

Phenolphthalein indicator is used in the boiler water test for __________.

dissolved oxygen

alkalinity

chloride content

hardness

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