객관식
According to general solubility rules, is Li3PO4 (lithium phosphate) soluble in water?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
객관식
Which of the following compounds will have increased solubility in water as the acidity of the solution increases?
A
MgSO4
B
KNO3
C
NaCl
D
CaCO3
검증된 단계별 안내1
Understand that solubility changes with acidity when the compound contains an ion that can react with H\_3O\^+ (or H\^+). This often applies to salts containing basic anions like carbonate (CO\_3\^{2-}).
Identify the ions in each compound: MgSO\_4 dissociates into Mg\^{2+} and SO\_4\^{2-}, KNO\_3 into K\^+ and NO\_3\^-, NaCl into Na\^+ and Cl\^-, and CaCO\_3 into Ca\^{2+} and CO\_3\^{2-}.
Recognize that SO\_4\^{2-}, NO\_3\^-, and Cl\^- are conjugate bases of strong acids (H\_2SO\_4, HNO\_3, and HCl respectively) and do not react significantly with H\^+, so their solubility is not strongly affected by acidity.
Note that CO\_3\^{2-} is a base that can react with H\^+ to form HCO\_3\^- and eventually H\_2CO\_3 (carbonic acid), which decomposes to CO\_2 and H\_2O. This reaction removes CO\_3\^{2-} from solution, shifting equilibrium and increasing solubility of CaCO\_3 as acidity increases.
Conclude that CaCO\_3 will have increased solubility in acidic solutions due to the reaction of carbonate ions with H\^+, while the other salts will not show this behavior.
