Multiple Choice
Which of the following ions always form soluble ionic compounds in water?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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Which one of the following compounds is insoluble in water?
A
NaNO_3
B
NH_4Br
C
K_2SO_4
D
AgCl
Verified step by step guidance1
Understand that solubility in water depends on the nature of the compound and common solubility rules in chemistry.
Recall that most nitrates (NO_3^-), ammonium salts (NH_4^+), and alkali metal salts (like K^+) are generally soluble in water.
Recognize that NaNO_3, NH_4Br, and K_2SO_4 all fall into these categories, so they are expected to be soluble.
Know that silver chloride (AgCl) is a classic example of a compound that is insoluble in water due to the low solubility of most silver halides.
Therefore, by applying solubility rules, identify AgCl as the compound that is insoluble in water.
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