Based on general solubility rules, which of the following compounds is most likely to be insoluble in water?
A
AgCl
B
K_2SO_4
C
NaNO_3
D
NH_4Br
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1
Recall the general solubility rules for ionic compounds in water, which help predict whether a compound will dissolve or remain insoluble.
Identify that compounds containing alkali metal ions (like K\(\textsuperscript{+}\)) and the ammonium ion (NH\(\textsubscript{4}\)\(\textsuperscript{+}\)) are generally soluble in water.
Recognize that most nitrate (NO\(\textsubscript{3}\)\(\textsuperscript{−}\)) salts are soluble without exception.
Note that sulfate salts (SO\(\textsubscript{4}\)\(\textsuperscript{2−}\)) are usually soluble, with some exceptions like barium sulfate or lead sulfate, but potassium sulfate (K\(\textsubscript{2}\)SO\(\textsubscript{4}\)) is soluble.
Understand that silver chloride (AgCl) is a classic example of an insoluble salt because silver halides (except AgF) are generally insoluble in water.