Asked by Briana Bradley on May 26, 2024
Verified
Which formula best characterizes hard-water scum?
A) [CH3(CH2) 16CO2]2Ca
B) CH3CH2CH=CHCH2CH2CH2CO2H
C) CH3(CH2) 16CO2Na
D) CH3(CH2) 16CO2H
E) CH3(CH2) 16SO3Na
Hard-water Scum
The residue formed by the reaction of soap with the magnesium and calcium ions present in hard water.
Best Characterizes
Describes the trait or quality that is most typical or representative of something.
- Identify and delineate the structure and properties of soap and detergent molecules.
- Understand the chemical basis of soaps' cleaning action and their interaction with hard water.
Verified Answer
ZK
Zybrea KnightJun 01, 2024
Final Answer :
A
Explanation :
Hard-water scum is typically characterized by the reaction of calcium ions (Ca²⁺) in hard water with fatty acids in soap, forming insoluble compounds. Choice A represents a calcium salt of a fatty acid, which is consistent with the composition of hard-water scum.
Learning Objectives
- Identify and delineate the structure and properties of soap and detergent molecules.
- Understand the chemical basis of soaps' cleaning action and their interaction with hard water.
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