객관식
In acid–base terminology, what is another name for a basic solution?
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17. Acid and Base Equilibrium
Bases
객관식
Which of the following compounds would be found as mostly molecules when placed into water?
I. Be(OH)2 II. HNO3 III. LiOH IV. (CH3)2NH V. CaO
A
I, IV, V
B
I only
C
I and IV
D
IV only
E
None of the above
검증된 단계별 안내1
Understand that when compounds dissolve in water, they can either ionize completely, partially, or remain mostly as intact molecules depending on their nature (ionic or molecular) and their acid/base strength.
Identify the nature of each compound: Be(OH)\_2 is a metal hydroxide with some covalent character and is only slightly soluble, so it tends to remain mostly as molecules rather than fully dissociating.
HNO\_3 is a strong acid and ionizes completely in water, so it will not be found mostly as molecules but as ions.
LiOH is a strong base and ionic compound that dissociates completely into Li\^+ and OH\^- ions in water.
(CH\_3)\_2NH (dimethylamine) is a weak base and a molecular compound that does not fully ionize in water, so it remains mostly as molecules.
CaO reacts with water to form Ca(OH)\_2, which is ionic and dissociates significantly, so CaO itself would not be found mostly as molecules in water.
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