Multiple Choice
Barium bromide (BaBr_2) dissolves in water. Which statement is true?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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Which of the following reactions would occur to a measurable extent in water?
A
AgNO_3(aq) + NaCl(aq) → AgCl(s) + NaNO_3(aq)
B
NaNO_3(aq) + KCl(aq) → NaCl(aq) + KNO_3(aq)
C
BaCl_2(aq) + Na_2SO_4(aq) → BaSO_4(s) + 2NaCl(aq)
D
KBr(aq) + NaNO_3(aq) → KNO_3(aq) + NaBr(aq)
Verified step by step guidance1
Identify the type of reactions given: these are double displacement (metathesis) reactions occurring in aqueous solution.
Recall that for a reaction to occur to a measurable extent in water, one of the products must be either a precipitate (insoluble solid), a gas, or a weak electrolyte (like water).
Use solubility rules to determine which products are insoluble and will precipitate out of solution. For example, silver chloride (AgCl) and barium sulfate (BaSO_4) are known to be insoluble in water and form precipitates.
Check each reaction: if the products include a precipitate, the reaction will proceed to a measurable extent; if all products remain soluble, the reaction will not proceed significantly.
Conclude that reactions forming AgCl(s) and BaSO_4(s) will occur measurably, while those producing only soluble ions will not.
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