Which of the following compounds would have an increase in solubility when placed into an acidic solution?
A
CaBr2
B
NaI
C
KCN
D
LiNO3
E
Hg2Br2
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1
Identify the nature of each compound and whether its solubility is affected by changes in pH, particularly acidic conditions.
Recognize that compounds containing anions that can react with H+ ions (from acid) may have increased solubility due to the removal of the anion by protonation.
Analyze each compound: CaBr\_2 and NaI contain halide ions (Br\^- and I\^-), which are the conjugate bases of strong acids and do not react significantly with H+; thus, their solubility is not increased in acid.
KCN contains the cyanide ion (CN\^-), which is the conjugate base of a weak acid (HCN). In acidic solution, CN\^- reacts with H+ to form HCN, reducing CN\^- concentration and shifting the dissolution equilibrium to dissolve more KCN, increasing its solubility.
LiNO\_3 and Hg\_2Br\_2 do not have anions that react with H+ in a way that increases solubility; LiNO\_3 is highly soluble and unaffected by pH, and Hg\_2Br\_2 is a sparingly soluble salt without acid-base reactive ions.