Deborah was given a set of incomplete reactions, with only the reactants shown.

Question

Deborah was given a set of incomplete reactions, with only the reactants shown. She was asked to identify in which cases a chemical reaction would occur (in the reactants below, C2H302 is the acetate ion): (1) CsCl(aq) + LiNO3(aq) (II) NaClo,(aq) +. Pb(C2H3O2)2(aq) (III) K2CO3(aq) + AgCIO3(aq) K (IV) LiOH(aq) + MgCl2(aq) Based on the reactants shown above, which combinations should Deborah classify as yielding a chemical reaction when the aqueous solutions are combined? (I) and (III) only (11) and (IV) only C (III) and (IV) only (I), (II), and (III) only (II), (III), and (IV) only

Explanation / Answer

(I)

CsCl (aq.) + LiNO3 (aq.) ---------> No net reaction occurs

(II)

2 NaClO4 (aq.) + Pb(CH3COO)2 (aq.) ------------> No net reaction occurs

(III)

K2CO3 (aq.) + 2 AgClO3 (aq.) -----------> Ag2CO3 (s) + 2 KClO3 (aq.)

Net reaction:

2 Ag+ (aq.) + CO32- (aq.) --------------> Ag2CO3 (s)

(IV)

2 LiOH (aq.) + MgCl2 (aq.) -------------> Mg(OH)2 (s) + 2 LiCl (aq.)

Net reaction:

Mg2+ (aq.) + 2 OH- (aq.) -------------> Mg(OH)2 (s)

Therefore,

(C) III and IV yield net reaction products.

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