Multiple Choice
Which of the following compounds is least soluble in water?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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According to general solubility rules, is CaCO3 soluble or insoluble in water?
A
CaCO3 is insoluble in water.
B
CaCO3 is partially soluble in water.
C
CaCO3 is soluble in water.
D
CaCO3 is highly soluble in water.
Verified step by step guidance1
Recall the general solubility rules for ionic compounds in water, which help predict whether a compound will dissolve significantly or not.
Identify that carbonate compounds (CO\_3^{2-}) are generally insoluble in water, except when paired with alkali metal ions (like Na^+, K^+) or ammonium (NH\_4^+).
Recognize that calcium (Ca^{2+}) is an alkaline earth metal ion, and calcium carbonate (CaCO\_3) does not fall under the exceptions for carbonate solubility.
Conclude that CaCO\_3 is considered insoluble in water based on these solubility rules, although it may have slight partial solubility due to equilibrium with dissolved ions.
Therefore, according to general solubility rules, CaCO\_3 is classified as insoluble in water.
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