Multiple Choice
Which statement best explains why sugar (C_12H_22O_11) dissolves easily in water?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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Which of the following lead compounds is completely soluble in water?
A
PbCO_3
B
Pb(NO_3)_2
C
PbSO_4
D
PbCl_2
Verified step by step guidance1
Recall the general solubility rules for ionic compounds in water, which help predict whether a compound will dissolve completely, partially, or be insoluble.
Identify that nitrates (NO_3^-) are generally soluble in water regardless of the cation, so compounds like Pb(NO_3)_2 are expected to be completely soluble.
Recognize that carbonates (CO_3^{2-}) and sulfates (SO_4^{2-}) often have limited solubility, especially with heavy metal cations like Pb^{2+}, so PbCO_3 and PbSO_4 tend to be insoluble or only slightly soluble.
Note that chlorides (Cl^-) are usually soluble, but lead chloride (PbCl_2) is an exception because it has limited solubility in cold water and only partially dissolves.
Conclude that among the given lead compounds, Pb(NO_3)_2 is the one that is completely soluble in water due to the nitrate ion's high solubility.
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