NY Regents Chemistry Exam August 2023 Question 40
40 Which solutions react to produce an insoluble compound?
(1) KCl(aq) + LiCl(aq) →
(2) LiCl(aq) + NaNO3 (aq) →
(3) NaCl (aq) + AgClO3 (aq) →
(4) KNO3 (aq) + AgClO3(aq) →
Solution: These are double replacement reactions: AB + CD --> AD + CB
First, we need to predict the products. Next, we need to check Table F on the Reference Table to find if either one of the products is insoluble. Let's look at each answer choice:
(1) KCl(aq) + LiCl(aq) → KCl + LiCl = both are soluble
(2) LiCl(aq) + NaNO3 (aq) → LiNO3 +NaCl = both are soluble
(3) NaCl (aq) + AgClO3 (aq) → NaClO3 + AgCl (insoluble): Correct Answer
(4) KNO3 (aq) + AgClO3(aq) → KClO3 + AgNO3 = both are soluble
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