Multiple Choice
Which of the following compounds is most commonly used as a solvent in laboratory settings?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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Calcium carbonate is most likely to dissolve in water with which of the following characteristics?
A
High concentration of calcium ions
B
Presence of sodium chloride
C
High pH (basic conditions)
D
Low pH (acidic conditions)
Verified step by step guidance1
Understand the nature of calcium carbonate (CaCO\_3) as a sparingly soluble salt that can dissolve in water depending on the solution's conditions.
Recall that calcium carbonate dissolves better in acidic conditions because the acid provides H\^+ ions that react with carbonate ions (CO\_3\^{2-}) to form bicarbonate (HCO\_3\^-) or carbonic acid (H\_2CO\_3), which shifts the equilibrium toward dissolution.
Recognize that a high concentration of calcium ions (Ca\^{2+}) in solution will suppress the dissolution of CaCO\_3 due to the common ion effect, reducing its solubility.
Note that the presence of sodium chloride (NaCl) mainly affects ionic strength but does not significantly increase CaCO\_3 solubility because it does not react with carbonate ions or calcium ions.
Understand that high pH (basic conditions) means fewer H\^+ ions are available to react with carbonate ions, so CaCO\_3 is less soluble under basic conditions compared to acidic conditions.
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