Multiple Choice
According to solubility rules and typical laboratory data, what is the approximate mass of NH4Br (ammonium bromide) that can dissolve in 100 g of water at 80 °C?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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When aqueous solutions of AgNO_3 and NaCl are mixed, a precipitate forms. Which compound is the precipitate?
A
AgNO_3
B
AgCl
C
NaNO_3
D
NaCl
Verified step by step guidance1
Identify the ions present in the solutions before mixing: AgNO_3 dissociates into Ag^{+} and NO_3^{-} ions, and NaCl dissociates into Na^{+} and Cl^{-} ions.
When the two solutions are mixed, consider all possible combinations of cations and anions that can form new compounds: Ag^{+} can combine with Cl^{-} to form AgCl, and Na^{+} can combine with NO_3^{-} to form NaNO_3.
Recall the solubility rules: most nitrate (NO_3^{-}) salts and sodium (Na^{+}) salts are soluble in water, so NaNO_3 remains dissolved.
Silver chloride (AgCl) is known to be insoluble in water and will form a solid precipitate when Ag^{+} and Cl^{-} ions combine.
Therefore, the precipitate formed upon mixing AgNO_3 and NaCl solutions is AgCl.
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