The common ion effect states that the solubility of a salt is lower in the presence of a common ion. This means if there is a higher concentration of a common ion present, the less soluble a compound will be.
In which of these solutions will HNO2 ionize less than it does in pure water?
A. 0.10 M NaCl
B. 0.10 M KNO3
C. 0.10 M NaOH
D. 0.10 M NaNO2
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