Multiple Choice
Which term describes the ability of a substance to dissolve in another substance?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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Which of the following hydroxide compounds is insoluble in water?
A
KOH
B
Ca(OH)_2
C
NaOH
D
Fe(OH)_3
Verified step by step guidance1
Step 1: Understand the concept of solubility in water, especially for hydroxide compounds. Solubility depends on the nature of the metal ion and the hydroxide ion interaction with water molecules.
Step 2: Recall that hydroxides of alkali metals (such as KOH and NaOH) are generally highly soluble in water because these metals form strong ionic bonds that dissociate easily.
Step 3: Recognize that hydroxides of alkaline earth metals like Ca(OH)\_2 are moderately soluble in water; calcium hydroxide is slightly soluble, producing a basic solution.
Step 4: Identify that transition metal hydroxides, such as Fe(OH)\_3, tend to be insoluble in water due to their strong lattice energies and lower tendency to dissociate into ions.
Step 5: Conclude that among the given options, Fe(OH)\_3 is insoluble in water, while KOH, NaOH, and Ca(OH)\_2 are soluble to varying degrees.
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